Climbing is the activity of using one's hands, feet, or other parts of the body to ascend a steep topographical object that can range from the world's tallest mountains (e.g. the eight thousanders) to small boulders. Climbing is done for locomotion, for sporting recreation, for competition, and is also done in trades that rely on ascension; such as rescue and military operations. Climbing is done indoors and outdoors, on natural surfaces (e.g. rock climbing and ice climbing), and on artificial surfaces (e.g. climbing walls).

Professional mountain guides or rock climbing guides (e.g. the UIAGM), were a significant element in developing the popularity of the sport in the natural environment, and remain so today. Since the 1980s, the development of competition climbing and the availability of artificial climbing walls have dramatically increased the popularity of rock climbing as a sport, and led to the emergence of professional rock climbers, such as Wolfgang Güllich, Chris Sharma, Adam Ondra, Lynn Hill, Catherine Destivelle, and Janja Garnbret.

Climbing became an Olympic sport for the first time in the 2021 Olympic Games in Tokyo (see Sport climbing at the 2020 Summer Olympics) for sport climbing and speed climbing disciplines.