What is wrong if your sink drain seems clogged and you used a 20 ft snake and nothing is in the pipe but if you pour two cups of water in the drain the water will not go down?

The drain is clogged! The situation is either the 20' snake was not long enough to reach the clog or, another equal possibility is that the snake went through the clog then the clog re-sealed behind the snake. This is quite common with grease or sludge type clogs. How long is the pipe before you get to a larger clear pipe? will 20" reach it? Is it just a hand snake you are using? Are you ready for a pro to take over? Trust me he will make it look easy! either your branch line is longer than 20' and you need a longer snake or the clog is in your main line and it needs snaked