in Sicillian defense why black moves 5...a6?

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Spooonkiller

now im little curious why this move is necessary. why black didnt play e5 directly? anyone know

Spooonkiller
e4 c5 f3 d6 d4 cxd4 Nxd4 Nf6 Nc3 a6 < this line
Sqod
I think you're asking two different things.
(1) As for ...e5, ...e5 leaves the d-pawn weak at d6 and gives up hope of getting a pair of pawns in the center.
(2) As for ...a6, I'm not sure of its purpose, although I know the Najdorf is considered a "sharp" line, probably because of that risky tempo loss, and I know that ...a6 is important in other openings such as in one variation of the Queen's Gambit, largely to keep White's pieces off the b5 square, and to prepare for ...b5, which is a standard part of Black's queenside attack in the Sicilian.
Spooonkiller
Thank you sir Im now fully understanded