also: してもよい
expression
may do; can do; it's okay to do
Expresses permission, allowance, or that doing something is acceptable. Often used when giving or asking for permission. The よい variant is more formal.
ここで写真を撮ってもいいですか。
May I take a picture here?
疲れたなら、休んでもいいよ。
If you're tired, you can rest.