Each field in a database holds a single piece of data. For example, in a database holding information about owls, you might have a table holding data about owl sitings. In this table, the fields might contain the siting date, the type of owl sited, the location and the name of the person who did the siting, or rather a link to the person in the person table (see relational database definition)
[...] siting will be for a particular type of owl, in a particular place, by a particular person. The tables and fields article shows how two tables are linked together. The following diagram is called an entity [...]