VidiEditor's snap tool is designed to easily align segments to each other frame accurately when moving those on the timeline. It can be found in the timeline's toolbar or toggled via keyboard shortcut.
The icon indicates if it is turned on or off by appearing blue or grey respectively. If turned on, the user will see an arrow icon when moving a segment (A) close to an IN / OUT point of another segment or (B) close to the timeline playhead position. While seeing this arrow indicator and releasing the move (release left mouse key) the segment will frame accurately be positioned on the next frame after (A) the cut position or (B) at the playhead position.
This works on the IN/OUT of a segment on one track as well as on cuts of segment on a different track.
Also the feature is usable when using drag and drop to insert media from search an bin to timeline (compare Add Media into the Timeline [VE UG] ).