Limes are great for recipes or to just put into your water, tea, or beverage of choice.
They are yellow like lemons and taste somewhere between a lemon and a lime. Fairly certain they are Mexican Limes, also known as Key lime, Bartender’s lime, and West Indian lime. Or more likely it's the Persian lime, as it's a cross between key lime and lemon. I have used them in key lime recipes with great success.