When you splice clips together, the location at which one clip changes to another is called a cut. A cut is useful when you want to extract part of an element or end a shot at a given frame.
You can make a cut at any point on the record clip. A cut creates a transition with a head equivalent to the duration of the segment before the cut and a tail equivalent to the duration after the cut. For example, if you make a cut after the 5th frame in a 10-frame clip, the cut has a tail of 5 frames and a head of 5 frames.
In a match frame cut, the outgoing and incoming shots are from the same source and the outgoing and incoming frames are consecutive. Match frame cuts are indicated by an “=” on the cut point.
In Storyboard view, cuts are indicated by yellow lines if they are on the focus layer, and grey lines if they are on the non-focus layer. See Identifying Cuts and Transitions.
(a) Cuts between clips on focus layer
Image courtesy of Quietman
(a) Focus point (b) Yellow bounding box indicates implicit selection by positioner
A match frame cut is added at the specified location.
The cut is removed and the two elements are joined together.