Megabyte: 1 million bytes, the main unit for measuring memory. A byte is a basic unit of computing, roughly equivalent to the storage needed for one character a letter or numeral. Most systems have 1 to 4 megabytes of main memory and a 40 megabyte or 80 megabyte hard disk. Some older systems have less than 1 megabyte of main memory, measured in kilobytes or thousands of bytes.
Spreadsheet: An electronic ledger made up of a grid of rows and columns creating individual cells which can be used for financial analysis or creating forms. You can include formulae in a cell to perform calculations working out the VAT on every purchase and adding it together each quarter, for instance.
Database: An electronic card index which stores information, sorts it, searches for individual cards and selects items from them for building up into reports.
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