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Click track

A click track is a series of audio cues used to synchronize sound recordings, sometimes for synchronization to a moving image. The click track originated in early sound movies, where optical marks were made on the film to indicate precise timings for musical accompaniment. It can also serve a purpose similar to a metronome, as in the music industry, where it is often used during recording sessions and live performances.[1]

Metronome

From the glossaries: and about.com Archived 10 January 2016 at the Wayback Machine

BBC

 – A thorough explanation

What is a click track?

 – In search of the click track

musicmachinery.com

for hitpoint composition like for soundtracks

Clickbook

 – software to generate click tracks.

Click Tracker