Most people in the world when asked about indica and sativa have no idea what it is. Indica and sative are types of cannabis plants that can be mixed together to form hybrid strains with each type having their own medicinal values and desired effects.
Indica
Indica cannabis plants are short and bushy compared to its counterpart. Indicas strains are best for growing indoors because of there short height. It has more CBD than THC which in turn creates a extreme physical high (couch lock) which is good for things like pain and insomnia. Indica strains are best used before going to bed or if you plan on staying in for the night. They also tend to have a higher yield than sativa strains. Indica buds tend to be darker green in color.
Examples...