Difference between feminized seeds and regular seeds

Hi Everybody! Im a little confused with the difference between regular seeds and feminized seeds. I get my seeds from the attitude site and for example they have feminized sour diesel seeds and regular sour diesel seeds. Whats the difference??THe crazy thing is, is that the Reserva Privada company sells 6 feminized sour diesel seeds for 105 bux and 13 regular sour diesel seeds for like 115 bux!

Regular seeds can be male or female. Feminized seeds will be female only, 99% of the time.

99.9* percent

yea that^.