Portable toilet are simple portable enclosures containing a chemical toilet

Chemical toilet

A chemical toilet is a toilet which uses chemicals to deodorize the waste instead of simply storing it in a hole, or piping it away to a sewage treatment plant. Common types include aircraft lavatory, some passenger train toilets and the portable toilets used on construction sites and at large...

 which are typically used as a temporary toilet for construction sites and large gatherings and events. Most of the portable toilets have black open-front-U-shaped toilet seat with cover. They are often constructed out of light weight molded plastic

Plastic

A plastic material is any of a wide range of synthetic or semi-synthetic organic solids used in the manufacture of industrial products. Plastics are typically polymers of high molecular mass, and may contain other substances to improve performance and/or reduce production costs...

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General Information
Portable toilets are referred to colloquially as P-Pot, Porta-John, PortaJane, Port-O-Let, Port-a-Loo, Portaloo Porta-Potty, Tidy John, Kybo, Biffs, Standard Porta Potty Restrooms, and Toi-Toi – some of which may be trademarked – and more formally as a "Portable Sanitation Unit".
Portable toilets are large enough for a single occupant – usually about 90 cm (3 ft) on a side by 210 cm (7 ft).