There are two types of triggers; database triggers and user-interface (UI) triggers. Database triggers allow you to perform validation or some other processing when data is read from to written to the database. UI triggers allow you to take some action when a UI event occurs (e.g. a user clicks on a button).
The Programming Handbook explains how triggers work far better than I could and it shows some examples. Have a look in there first and if you have any questions, come back to us in the forum.
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