What is the difference between regular, feminized and autoflowering seeds?

Regular seeds are created from a male and female plant. The pollen from the male fertilizes the female, which in turn produces seeds. These seeds are called regular seeds because they are produced in the "regular" natural way. Feminized seeds, on the other hand, are created from a female and another female plant. One of the females is subjected to stressful conditions to create pollen, which will fertilize the other female. Autoflowering seeds are different to other standard photoperiod strains. They produce plants whose life cycle is not affected by changes in light hours. They will enter flowering stage automatically according to their age, hence the name autoflowering.