Female is the sex of an organism that produces the large non-motile ova (egg cells), the type of gamete (sex cell) that fuses with the male gamete during sexual reproduction.
A female has larger gametes than a male. Females and males are results of the anisogamous reproduction system, wherein gametes are of different sizes, unlike isogamy where they are the same size. The exact mechanism of female gamete evolution remains unknown.
In species that have males and females, sex-determination may be based on either sex chromosomes, or environmental conditions. Most female mammals, including female humans, have two X chromosomes. Female characteristics vary between different species with some species having pronounced secondary female sex characteristics, such as the presence of pronounced mammary glands in mammals.
In humans, females(women) have many physical differences to the males (men) that gives them an unique figure. They have a curved spine to balance themselves when pregnant, have a bigger pelvis to be able to birth children, their fat distribution is mainly in the buttocks and thighs. Women have much more breast tissue and mammary glands. They have thin waists and most of the time have more pleasing faces than men, the average woman is shorter than average man and has smaller feet/hands. It is more difficult for women to develop muscle tissue due to hormonal differences. While men are in the shape of 'V' women are in the shape of an hourglass, from the front their breasts protrudes and from the back their buttocks do.