Tecnology

2. software or hardware that, after checking information coming into a computer from the Internet or an external network, either blocks the transmission or allows it to pass through, depending on the pre-set firewall settings, preventing access by hackers and malicious software ; often offered through computer operating systems.
4. words or phrases prefixed with the symbol # (the pound sign); used to mark keywords or topics in a Tweet or social networking service.

1. also called “data transfer rate,” the amount of data that can be carried online from one point to another in a given time period, usually expressed in bits (of data) per second (bps) or bytes per second (Bps). Dial-up Internet accounts, which use a standard telephone line to connect to an Internet Service Provider (ISP), have a very narrow bandwidth (about 50 Kbps or 50,000 bits per second) and take a long time to download data. A broadband Internet account can move data at anywhere from 128 Kbps to 2,000 Kbps or more and can download large files, such as video files, much faster.
3. Address a unique identifier in the form of a numerical label assigned to each device, such as a personal computer or server, participating in a network, such as the Internet.
5. a personalized graphic file or rendering that represents a computer user or user’s alter ego, often used on Web exchange boards and in online gaming; can be a real-life digital photo, but is more often a graphical representation.