Autoflowering cannabis seeds require no specific lighting schedule and go into flower after roughly 2-3 weeks. The strain Lowryder by Joint Doctor was the original large scale marketed autoflower.
With a shorter life span than most cannabis strains, many autoflowers finish in around 13 weeks from seed and some in a blisteringly fast 7! They can easily be kept short for stealth grows, and their shorter life cycle lends them to use in colder climates outdoors, where warm seasons may be shorter. In warmer climates it can allow for multiple crops per season.
Their lack of lighting schedule mean that they can thrive outdoors where artificial lights, such as street lamps, would affect their growcycle and stress the plants. Many varieties also have a higher CBD content, making them great for relaxation and medicinal use.