From Working holiday visa:
A working holiday visa is a residence permit allowing travellers to undertake employment (and sometimes study) in the country issuing the visa to supplement their travel funds. For many young people, holding a working holiday visa enables them to experience living in a foreign country without undergoing the usual costly expenses of finding work sponsorship in advance or going on expensive university exchange programmes.
As you might imagine, there is a wide variety of rules and conditions for these, depending on the country in question. In general, a working holiday visa is valid for a longer period of time than a regular tourism visa, and is generally only available for young people (typically under 35 or younger).