Fun fact: The term biceps brachii comes from a Latin phrase meaning "two-headed muscle of the arm." The word muscle itself comes from the Latin word for "little mouse" (musculus) because it was thought that the flexed biceps resembled the back of a mouse.
Humans use their biceps muscles for everything from lifting to throwing to grabbing to climbing. For my upcoming climb, well-developed biceps will be crucial. Success in upper-body endeavors is impossible without them. The top biceps exercise is probably the biceps curl, but pull ups also strengthen the biceps as well as the back and shoulders.
This is one reason why my fitness routine has both biceps curls and pull ups. Sorta like Yin and Yang, light and dark, or Netflix and Hulu (?).
Have a wonderful day!