Any type of armor with Projectile Protection basically makes it so you receive less damage from arrows, like when skeletons shoot you or if you shoot an arrow straight into the air and it hits you when it comes down.
it makes your armor stronger so you lose less lifes
Makes it so that items that shoot (I.E Arrows) cause you less damage.
The protection enchantment will take a certain percentage of any form of damage dealt to you and put the damage on your armour not the player. Projectile projection does the she thing but only when you are hit by projectiles (e.g. an arrow)
Protection 1 in Minecraft simply 'ups' the level of damage absorbed by your armor.
Makes it so that items that shoot (I.E Arrows) cause you less damage.
Not sure if this is what you mean, but a sight is a device on a gun or other projectile weapon that indicates where the projectile is going.
Blaze protection, or fire protection is an enchantment applied to armor. It reduces the amount of damage done by fire and lava.
Blast Protection is an enchantment applied to armor. It protects you from explosions, such as from a TNT blast or from a creeper.
If by 'What website is for Minecraft?' you mean 'What website do you play Minecraft on?' than the answer is simply Minecraft.net :)
a projectile is the answer
It doesn't mean anything specific 'in Minecraft', it is short for Major League Gaming.
'Pocket Edition', it is Minecraft for iPads and smartphones.