Dogs like to lick people for the following reasons:

Express your love for you. The dog will rush towards you excitedly and keep licking you with its tongue, expressing its welcome and wanting you to play with it.

Hungry. When it’s meal time and you forget to feed it, your dog will lick you to remind you to feed it.

It tastes delicious on your hands. If you eat something your dog likes secretly, and the smell of the food still remains on your hands, your dog will not be able to help but lick you.

In addition, there are reasons such as respecting you, feeling uncomfortable, and apologizing.