Anyone can buy and sell almost anything & everything through OLX. Purchases are really easy because one can contact the buyer/seller directly though his/her personal number.
Direct dealing, no brokers, no commissions. All we need to have a camera to click some close up shots of the product to sell it. Buying second hand products is also very easy. You can even give free ads on this site. Olx has all the necessary filters at the top and left side of the product category. So in every sense its a very useful site.