Classic Wiki Ukulele

A small guitar derived from the machada, or machete, a four-stringed guitar introduced into Hawaii by the Portuguese in the 1870s. It is seldom more than 24 inches (60 cm) long.

Source britannica

The ukulele is played similarly to a guitar, by strumming. It is commonly tuned in the middle C octave and is popularly used in jazz ensembles, bluegrass and even as a solo instrument. The ukulele has different types according to its' pitch: soprano, tenor and baritone. There are also concert model ukuleles which is tuned to the key of C. A taro patch is a ukulele that has 8 strings and a tiple is like a ukulele that has 10 strings.

Source about.com

The Ukulele Orchestra of Great Britain plays the Good, the Bad and the Ugly youtube video