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(1) In word processing, a block is a group of characters that you have marked to perform
some action on them. For example, to move a section of text, you must first block it. This
is sometimes called a block move.
To specify a block of text, you press special function keys (or click with a mouse) at the
beginning and end of the block. The function keys differ from one word processor to
another. Word processors usually display blocks by highlighting them on the screen.
(2) In data management, a block is a group of records on a storage device.
Blocks are manipulated as units. For example, disk drives often read and write data in
512-byte blocks.
(3) In communications, a block is a fixed-size chunk of data that is transferred together.
For example, the Xmodem protocol transfers blocks of 128 bytes. In general, the larger
the block size, the faster the data transfer rate.
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