The Holga camera is a cheap plastic 120 roll film camera, made in China, originally for the home market.
It gradually became available outside China in th 1990's, and gained a cult following among creative photographers. The main appeal of the Holga lies in it's extreme simplicity. There is only one shutter speed and one or two apertures, depending on the model. Focusing is very much by guesswork, aided by symbols on the lens for distance, which may or may not be accurate.
Light leaks, blur and vignetting (darkening of the corners due to the poor lens), all add up to make a truly remarkable camera! The so called faults of the camera somehow contribute to making the resulting photographs, in my view, full of feeling and serendipity, you never quite know what you are going to get until the film is developed.
The other thing about Holgas is their very basic construction, which makes them very suitable for modification, using simple hand tools, glue and lots of black tape.
The production of Holgas officially ceased in 2015, but due to popular demand from enlightened photographers around the world, production of some models has now resumed.