Wrestling means grappling. It can be done as a martial art, competitive sport, or entertainment spectable (eg WWE).
Sport wrestling includes Freestyle and Greco-Roman styles, which are both Olympic games. Catch Wrestling is also a very popular sport. Martial arts like Jujutsu, Judo and Sumo from Japan, BJJ from Brazil, and Shuai Jiao from China are also popular forms of wrestling with varying rulesets when applied as sports.