What does it mean to be knighted?

i know its a title that one can only obtain from royalty (or something). and i know it most likely orginated back in the times with knights, kings, queens, etc. but really, what is there to it, but the title (now anyway)? if someone named joe stein, after being knighted, his full title would be "sir... show more i know its a title that one can only obtain from royalty (or something). and i know it most likely orginated back in the times with knights, kings, queens, etc.
but really, what is there to it, but the title (now anyway)? if someone named joe stein, after being knighted, his full title would be "sir johnathan stein".

what is the origin, and meaning of being knighted. and why is it continued today. im really curious about this, so im looking for answers that delves quite deep into this.
Update: by the by..not sure if this is the right category..but it did seem fitting...
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