eBay

eBay, the market leader in online auctions, should typically be your first stop when selling or purchasing items online from other users. Simply said, with over 182 million active monthly users on eBay (and still rising), your items have a lot of better chances of selling, and you yourself also have a much better chance of finding what you're looking for here.

In addition, the site is very user-friendly, with various options for different purposes (such as for listing products globally), a detailed rating system, and a variety of payment methods. With a combination of auction-style bids and Buy It Now choices, eBay allows you to choose the method that suits you best, with auctions often resulting in better discounts.

This, however, comes at a cost. Literally. eBay is rather expensive in terms of costs, and although sellers get a set number of free listings each month, they still have to pay some commission fees on each transaction. There are also expenses associated with a slew of additional improved features, so it may become pricey. Still, eBay is unbeatable for attracting so many eyes to valuable things, and there's a reason it's so popular: it's exceedingly easy to use.

Users: 182 million

Website: https://www.ebay.com/