• The full form of VPN is Virtual Private Network.

• Virtual Private Network is an extension of private network across a public network for sending and receiving data. A VPN helps in functionality, Security, and management of private network.

• VPN technology was developed to allow remote users and branch offices to access corporate applications and resources. A virtual point to point network is established to create VPN.

• The full form of WPA is WIFI Protected Access.

• WIFI Protected Access is security certification and security protocols developed by the WIFI Alliance to secure wireless computer networks.

• WPA became available in 2003. In 2018, WPA3 is announced with advanced security features. WPA has been designed specifically to work with wireless hardware produced prior to the introduction of WPA protocol.

• The full form of PAN is Personal Area Network.

• Personal area network is a computer network for interconnecting devices centred on an individual person’s workspace. A PAN may be wireless or carried over wired interfaces such as USB.

• While WPAN is wireless personal area network is basically a PAN carried over a low powered wireless network.

• The full form of MPEG is Moving Picture Experts Group.

• Moving Picture Experts Group is a working group of authorities for audio and video compression and transmission. Hiroshi Yasuda established it in 1988.

• The MPEG standards consist of different Parts. Each part covers a certain aspect of the whole specification.

• The full form of RAM is Random Access Memory.

• Random Access Memory is a type of data storage used in computers that are placed in motherboard, it is volatile memory and temporary.

• The RAM chip may be individually mounted on the motherboard or in sets of several chips on a small board connected to the motherboard. There are two main types of RAM: dynamic random access memory, and static random access memory.

• The full form of ISP is Internet Service Providers.

• It is responsible to provide services for accessing, or participating in the Internet. ISPs also provide Internet access, Internet transit, web hosting, and collocation.

• A virtual ISP (VISP) is an operation that purchases services from another ISP, sometimes called a wholesale ISP. VISPs resemble mobile virtual network operators and competitive local exchange carriers for voice communications.

• The full form of IP is Internet Protocol.

• Internal Protocol is a numerical label designated to a computer network. Internet Protocol version defines an IP address as a 32 bit number.

• The IP address space is globally managed by the Internet Assigned Numbers Authority. Network administrators assign an IP address to each device connected.

• The full form of FAX is Facsimile. It is generally written and spoken as FAX.

• It is a scanned copy of text and images printed on a paper, sent from one party to another through a telephone line. It is used to send documents electronically over telephone network.

• The fax technology was invented by Alexander Bain in 1842. He was the first person who became able to transmit image/text through signals from telephone line.

• The full form of BCR in computer is Barcode Reader.

• Barcode Reader is basically an optical scanner that can read printed barcodes and decode the data and send the data to a computer.

• They can be of Pen type readers, Laser Scanners, CCD readers; Camera based readers, Omni directional barcode scanners, Cell phone cameras etc. Some barcode readers also support radio frequencies viz. 433 MHz or 910 MHz

• Alt+Tab is a shortcut key most often used to switch between open programs in Microsoft Windows and other operating systems.

• Ctrl+Y shortcut is used to redo the last action.

• Ctrl+Z is a shortcut key most often used to undo.

• Ctrl+N is used to create a new document.