Dottie,
Free play is what kids have at kindy...

But seriously, ya gotta have just a
little free play on your (manual gearbox) clutch, otherwise just touching the pedal would cause clutch slip (wearing the clutch plate) or the gears to disengage immediately with very little pressure on the pedal... both undesirable.
Too muchfree play and you'd be shoving the pedal to the floor, making it difficult to release clutch pressure, leading to much lever-shoving to change gears... also undesirable.
Clutch needs to disengage gears at a comfortable pedal-height for easy gear changes.
There's probably diagrams on Wikipedia...
(See, I
did listen when my mechanic Dad was explaining things when I was a kid!

)