Sicilian Defense Pin Variation B40s PDF, PDF, Board Games Competitions

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B70 - Sicilian Defense, Dragon Variation

Why would White play 2.a3 as their 2nd move in the Sicilian Defense? It's not an accepted opening and I see no benefits. How would you go about strategizing a reply, as

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Kamsky Gambit – Sicilian Najdorf Variation - Remote Chess Academy

Sicilian Defense: Normal, Pin Variation

Sicilian defense variation : r/chess

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Powerful Chess Opening Against the Sicilian Defense, Tricky Wing Gambit, theory