TEF is a file format used to store tab and sheet music notations for a variety of instruments. These files are mainly associated with TablEdit. Record in such a file can be visualized with simultaneous preview of traditional sheet music and tablature. Tablature is a simplified notation for stringed instruments with a fingerboard and shows at which fret and at what point to press the appropriate string.

In addition to stringed instruments, such notation is also used when playing, for example, a diatonic accordion, a harmonica or an instrument called xaphoon.