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High Beginning player question

Can anyone help me out with what I am sure is a very basic question for most members of this forum (please direct me to the proper category if I am abusing this category). What is the reasoning behind the h3 move in the game above? I know it's the correct move because it comes from a Fritz analysis, and I've seen it many times, but I don't understand its significance. Can some one help me out?

10.h3 does the following:
Controls the g4 square, leaving the black bishop with no squares to move to. And once the knight moves off of the d7 square, the bishop will only have 2 squares to move to: d7-e6. Neither of which places the bishop on an active square.
The move also keep the knight off of g4.
It also prepares an eventual g4 pawn push.
White can play something along the lines of g4-Nf1-g3-Be3-Qd2 with white having most of his pieces pointing at the black kingside, along with the space advantage due to the pawns on h3-g4.

It’s a standard sort of prophylactic move but in this specific position there are clearly alternatives as well. Fritz’s judgement isn’t at the level of most other engines but of course the move is fine.

Thanks for all of your responses. I know the question was very basic. I appreciate you indulging me.

10.h3 does the following:
Controls the g4 square, leaving the black bishop with no squares to move to. And once the knight moves off of the d7 square, the bishop will only have 2 squares to move to: d7-e6. Neither of which places the bishop on an active square.
The move also keep the knight off of g4.
It also prepares an eventual g4 pawn push.
White can play something along the lines of g4-Nf1-g3-Be3-Qd2 with white having most of his pieces pointing at the black kingside, along with the space advantage due to the pawns on h3-g4.
The above is just s/o wanting to type words. They're pretty much wrong. h3 is a waiting move and a stupid move at that. Itsa waste of tempo and like putting a barney band-aid on a unblemished finger.
[Event "5s/Move"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Glick, Barry"]
[Black "Fritz 16"]
[Result "*"]
[SetUp "1"]
[FEN "r1bqr1k1/pp1n1pbp/2pp1np1/4p3/3PP3/2PB1N2/PP1N1PPP/R1BQR1K1 w - - 0 10"]
[PlyCount "7"]
{444MB, Fritz 16.ctg, LAPTOP-66KQV2G4} 10. h3 d5 {0.14/14 1} 11. exd5 {0.14/14
0} Nxd5 {0.17/15 0} 12. dxe5 {0.05/16 1} Nxe5 {0.05/16 1} 13. Nxe5 {0.01/20 8}
*