Why do we use it?
Exclusive Offer: CLICK HERE to Create A Website For Just 0.01$ For Your First Month! Use Coupon: 1CENT.
Question ans Answer sites are similar to the online forum. A comparable thing is that forums are based on niche where questions and answer sites come up with non-niche web portals where a user can ask and answer for related similar questions in field which he is in interested.
Here are some of the Sites where you can ask and answer in interested aspects.