What are the differences between a ukulele and guitar?
While a ukulele looks like a smaller version of a guitar, there are some notable differences.

A guitar has 6 strings and a ukulele has 4 strings. Because of this, the sound range of a ukulele is narrower than a guitar.

Looking from the front of a guitar, the thickness of the strings increases gradually from right to left. For a ukulele, the two outmost strings are the thinnest and the second left string is the thickest. 

A ukulele is much smaller in the size, making it one of the most popular beginner instrument for kids.