Women's Specific Design
It would surprise some people but there are differences between men and women and therefore many points that should be addressed to make biking more fun and comfortable as a woman. A Women's specific bicycle has addressed the differences and is thus ready to go without modification.
Just remember that "uni-sex" or "men's" bikes can be adjusted to fit a woman perfectly! It may involve switching the seat as it won't come with your favourite seat, but all the adjustments are easily done. The point of the utmost importance when buying a new bike is to buy the right size - seats, handlebars, stem-lengths can all be switched or adjusted to suit your needs!
What make's a women's road bike? There are a couple minor differences that will
make a road bike fit you better and be more comfortable. On a women's
specific bike the handlebars have a slightly smaller drop and
different curve so that the brake levers are easier to reach for smaller hands.
The other major difference is that the seat will generally be a better quality
women's specific saddle that will improve your comfort while riding the bike.
There are a few more things that need adjusting on a mountain bike than a road
bike to make it better fit women comfortably. Besides the women's specific seat,
a woman's specific mountain bike may have a narrower handlebar and short reach
levers as well as lighter springs in the front shock.