A Portable Structure/ Portacabin or Temporary Structure designed and built to be movable rather than permanently located. A portable structure are more often used as temporarily and taken away later.

Portable structures have various uses. They are often seen, alone or in groups, as temporary Site Offices on Building Sites, as Guard Booths, Offices, on-site Changing Rooms, Class Rooms, Residential Rooms, and Toilets etc. Some portable structures are very complex by joining units these forming large office blocks. These are often disguised as a normal structure often with flat roof style cladding and a traditional pitched roof.

Due to population increases in many areas, portable buildings are sometimes brought in to schools to provide relief from overcrowding. Portable classroom buildings often include two classrooms separated by a partition wall and a toilet.

The most familiar modern type of portable container are designed so that one can be carried to or from site on a large lorry and slung on and off by a crane.