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S

SD and SDHC cards

Secure Digital (SD) cards are one type of flash memory card which store up to 2 GB of data. Secure Digital High Capacity (SDHC) cards are another type of flash memory and they are ideal for video cameras because they can store up to 32 GB of data.

SSL (Secure Sockets Layer)

A method of encrypting data to provide security for communications over networks such as the Internet. TLS (Transport Layer Security) is a later version of SSL.

Sat nav

A device, usually used in a car, that gives directions based on information received from a series of satellites.

Secondary source

Information or data that has been produced by someone else.

Secondary storage

Storing data on another device, such as a CD or USB pen.

Smart phone

A phone offering advanced features, e.g. the ability to send emails, surf the Internet.

Social networking site

An online community where people can communicate and share information.

Software

Programs that give instructions to a computer and which allow the user to carry out different tasks.

Spam

Unwanted or junk email sent to lots of recipients at the same time.

Specification (spec)

The technical details of a device or system.

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