Noodle soup is a kind of soup. It contains the normal soup stock, together with noodles, and sometimes other ingredients. This kind of soup is very popular in Asia, where it originally came from. There are also many instant soups of this kind.
Some of the varieties are:
Beef noodle soup - popular in China; noodles in a beef soup
Ban mian - popular in China, Malaysia and Singapore; a noodle soup with flat noodles, egg, and usually vegetables.