<Ol> - OL tags define an ordered list of items.

for example:-


<Optgroup> - OPTGROUP tag creates an option drop-down group menu.

For example –

  <optgroup label="Fruits">
    <option value ="banana">Banana</option>
    <option value ="pineapple">Pineapple</option>
  <optgroup label="Vegetables">
    <option value ="tomato">Tomato</option>
    <option value ="potato">Potato</option>

<Option> - OPTION tag creates a drop-down menu. OPTION tag works only in conjunction with a SELECT tag.

For example –

    <option value ="beginner" selected="selected">Beginner</option>
    <option value ="intermediate">Intermediate</option>
    <option value ="advanced">Advanced</option>

OBILE WEB - The Mobile Web is a channel for delivery of web content, which adapts the content to a mobile context. The mobile context is characterised by different things such as mobile constraints (screen size, keyboard input) and special capabilities (location, connection type such as 3G or Wifi).

OEM - usually means “original equipment manufacturer.” Sometimes it is referred to as “open-ended market” and used interchangeably with “bulk-pack”, “white box”, “brown box”, and “gray market”. Bulk-pack products usually do not have fancy packaging materials and are often produced in much higher volume, both of which result in much lower product prices. The OEM products are of the same quality and often carry the same manufacturer warranty as their retail counterparts (the single-pack). They often include supporting materials such as manuals and drivers when applicable.

OFDM - Orthogonal frequency-division multiplexing is used by 802.11a, g, n, and ac standards using multiple carrier frequencies. It is especially useful at obtaining higher throughput and overcoming interference in discrete frequencies.

Offline capture - A payment capture method used by merchants who ship an order one or more days after they receive it. The payment is captured when the merchant ships the order and sends a post-authorization message to the payment processor. 

Off-Peak - Hours generally associated with evenings and weekends. See also Night & Weekend Minutes.

OMAP (Open Multimedia Applications Platform) - A wireless processor developed by Texas Instruments and used in mobile devices.

 One Minute Video - A One Minute Video is a video exactly one minute in length, containing no camera movements (panning, tilting, etc.) or editing, and making use of original sound.

ONE-BILL® - A Verizon Wireless program that allows you to combine your Verizon Wireless charges and your Verizon Communications landline charges into one monthly bill.

Online - A computer or user is online when connected to a network or server that allows communication flow between computers. 

Online capture - A payment capture method used by merchants who ship an order on the same day that they receive it. The payment is captured when the credit card is authorized.

 Online Store - A web site that accepts direct payments in exchange for goods and services. 

Open Content -  Copyrighted information (such as this Glossary) that is made available by the copyright owner to the general public under license terms that allow reuse of the material, often with the requirement (as with this Glossary) that the re-user grant the public the same rights to the modified version that the re-user received from the copyright owner.

Open Mail Relay -  A mail server program that will accept e-mails from a third-party and forward them to different third-party computers, totally bypassing your e-mail client
Packet Switching: The method used to move data around on the Internet. In packet switching, all the data coming out of a machine is broken up into chunks. Each chunk has the address of where it came from and where it is going. This enables chunks of data from many different sources to co-mingle on the same lines, and be sorted and directed along different routes by special machines along the way. This way many people can use the same lines at the same time.

Open Network - An open wireless network permits association and authentication without requiring a passphrase, certificate, or credentials. Open networks are often called hotspots and provide free Internet access to anyone within range. Many coffee shops and restaurants will deploy these to attract customers. They may still incorporate a captive portal. See hotspots.

Open-Loop Card / Application - A system wherein general purpose cards that carry the American Express, Discover, MasterCard or Visa logo and can be used where ever those cards are accepted.

OpenStack Mitaka - The successor to the Liberty release of the OpenStack open source cloud computing platform, OpenStack Mitaka made its debut on April 7th, 2016 as the thirteenth major release ofOpenStack. Mitaka is the first major update in 2016 for OpenStack, with OpenStack Newton expected to be released in early October 2016, followed by OpenStack Ocata in April 2017.As with previous OpenStack releases, Mitaka takes its name from a nearby city or distinguishing feature relative to the OpenStack design summit corresponding to each OpenStack release. In this case, Mitaka is the name of a Japanese city with the metro area of Tokyo.

OpenX Market Rule - Enables OpenX Ad Server, Bidder, and SSP customers to specify what inventory is eligible for RTB buyers to purchase. Publishers can use this tool to set specific criteria for selling their inventory, such as: inventory targeting, floor price, and ad quality filters.

Operating System (OS) - The primary software that controls the basic operation of a mobile device, and a platform to run additional software apps.

Opportunities Tab – Located in the AdWords interface, this is a tool designed to help you get the most out of your PPC campaigns. Common suggestions include budget recommendations, potential keyword additions and more.  These are all automated opportunities, so use the opportunities tab with caution.

Opt in - The process by which a user agrees to receiving messages from a company. Opt in messages, therefore, cannot be considered as spam.

Opt out - The process by which a user elects to stop receiving messages from a company. If a user continues to receive messages after opting out these messages can be considered to be spam.

Optical Zoom - Optical Zoom is the lens' ability to change the focal length either closer to or further from a central subject.

Order - The top-level demand-side component in OpenX which represents the summary for an advertiser’s inventory purchase to run a marketing campaign. See the Orders section of the OpenX product documentation for more information.

Organic - In the context of search engine optimization and search engine marketing, organic results are those listings search engines show because of their relevance to a query, not because a site owner paid for an ad or paid to be featured.

Organic Traffic - Visitors who come to your Website from unpaid organic or natural search engine results.

OSI - On-schedule indicator. A column in the Order Summary report that indicates the percentage of delivered impressions for a line item relative to the impression goal and the time elapsed in a campaign.It is defined by the following calculation:-  OSI= impressions-to-date/((impression_goal/(end_date – start_date + 1)) * flight_time-to-date)

OTA (Over the Air) - A network app used to program digital devices by downloading the required Numeric Assignment Module (NAM) parameters and/or the Preferred Roaming List (PRL).

Other Charges and Credits - The section of your bill that includes charges for products and services and credits owing.

Our Best Apps Program - The Our Best Apps program is our list of suggestions for a great set of starter apps. They span a wide range of categories and functionality, and they’ll help you get the most out of your device. Apps are listed for each type of OS (e.g., Apple®, Android™, etc.).

Outsource - The process of contracting work to external, third-party organizations. 

Over The Shoulder - Over The Shoulder shots are framed with an emphasis on a particular character's perspective. This shot is used in dialogue scenes to show conversations between two people.

Overage Rate - The cost of usage (minutes, text messages and data) that exceeds your monthly allowances.

Overhead - The ongoing expenses associated with operating a business.