In the comparison table under the services column, you will see different descriptions:
“Exchange” means that they offer normal trading with cryptocurrencies.
“Seller” means that they do not offer trading with cryptocurrencies, instead they sell directly to customers. This usually means higher fees.
“CFD” means that they only offer to trade with CFD products. These are products for active traders.
“All-in-One” means that they offer normal trading with cryptocurrencies as well as CFD products.