We spend a lit of our time and energy trying, literally and figuratively, to reduce friction.
Friction tape is for just the opposite. That is, increasing friction. In this case, the word “friction” is a synonym for “grip”.
When you need to insure a slip proof grip on a tool, say a hammer handle, or a piece of sports equipment, the tacky feel of friction tape makes something easier to hold on to.
Friction tape is made a little differently than other tapes. Instead of having the adhesive laminated on one side of the tape, friction tape is actually impregnated with a rubber based adhesive, so that it is sticky on both sides.