The cup plunger is a standard plunger having a cup-like shape made of rubber and is used to clear clogs in sinks, tubs and showers. It should not be used for toilet clogs since it will not work due to its improper shape for toilets. Also, plungers used for toilet clogs should be seperated from tubs and sinks for sanitary reasons.
For toilet clogs, the use of a flange plunger is appropriate.
