whats the website to optifine? is it safe? what does it do?

Optifine
You can read in detail what it does on the home page, all it really does is help some with fps performance and enable a few more options for you to adjust and yes it is safe, 1 other thing it has is built in support for shaders.

Just type into Google 1.10 Minecraft Optifine

@TheForgotten20 whats the website to optifine? is it safe? what does it do?

Judging by the amount of players I know who use it, including myself, it is perfectly safe.

guys are tracer hacks ok? just for entities(i dont use it)

@TheForgotten20 No hacks of any kind are allowed.

ok