Multiple Field Search Noob Question [on hold]

As an example, how do you 'develop' or 'install' a search box similar to the one on this page www.icontainers.com? e.g. multiple search fields. Nothing particular about this page, it's just a good example. Same format can be used for e.g. rental cars, flights or transport with a start location, an end location and a type as the search fields. How is a multiple field search bar actually inserted in one's page? Any plugins? Thanks in advance.