Conventional loans usually call for 20% of the purchase price (if the buyer isn't paying mortgage insurance), while FHA loans only need 3.5% down payments.
Unless you buy a home with all cash, you'll need a down payment, a percentage of the purchase price. Your mortgage (and what the seller will accept) will dictate the amount. Conventional loans usually call for 20% of the purchase price (if the buyer isn't paying mortgage insurance), while FHA loans only need 3.5% down payments. VA and USDA loans can be taken out without a down payment.