Sativa plants are typically taller with long thin leaves. The bud of a sativa plant is typically less dense and some what feathery. Sativa products usually come with a cerebral feeling. Sativa strains a more uplifting and euphoric and are recommended for daytime use.
Indica plants are typically shorter with wide leaves. Buds of an indica plant will usually be dense. Individuals typicaly find that indica based strains are more relaxing. An indica strain will usually be associated with more boodily sensations. Therefore these strains are often recommendent for nighttime use.
A hybrid cannabis plant that is a cross breed between an indica and a sativa plant. Within this subset there can be indica dominant, and sativa dominant strains. There are also hybrid strains that are a relatively even indica/sativa split.