Who "give" a block reward?

[micloop]

I was thinking yesterday about the block reward and I made a question:
Who delimitate the size of block reward and this reward is taken from who?
Is it the sum of fees of transactions? And, How about when all the 21M of btc is mined, mining will be still profitable? If yes, where will it come from?

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[Josepht]

The size of the block reward was decided by Satoshi. It was 50 BTC for every block initially, but has ben halved to 25 BTC now, and will be halved in the future. The halving takes place every 210.000 blocks, so the next halving will be 140000 blocks from now.

After all BTC is mined, the miners will be paid with transaction fees. Wheter or not it's profitable depends on the price of BTC by then. We won't see that, since we will all be dead by then.

Edit: the reward is taken from no one, and is created from air.

[VRobb]

12.5 BTC per block reward, not 25.  That was last year.  Don't post "fake news"! 

[micloop]

Regardless of size of block, thanks you all for the replies. Specially you, Josepht.