The high volume of cash and credit cards that pass through a restaurant each day make a POS system a necessity. Not only does a POS system track every penny of your sales, many POS programs also act as credit card processors. This makes swiping credit cards more secure for both the customer and the business. Servers are accountable for all their sales, and it is impossible to alter checks in the computer unless you have the password. This helps cut down on employee theft.