Taken from : Wikipedia
A scimitar (pronounced /ˈsɪmɪtər/) is a sword with a curved blade design finding its origins in Southwest Asia (Middle East).
The name can be used to refer to almost any West Asian or South Asian sword with a curved blade, and is often thought of as having a ridge near the end.
Scimitars were used in horse warfare because of its relatively light weight when compared to larger swords and it is good for slashing opponents, while riding on a horse, because of its curved design. Mongols, Rajputs and Sikhs used scimitars in warfare among many other people.