Pump dispenser
A pump dispenser is used on containers of  liquids to help dispensing. They might be used on bottles, jars, or tubes. Often the contents are viscous liquids such as creams and lotions.  Some are metered to provide  uniform usage.  Some mix contents from two or more sources prior to dispensing.

Typical products
Liquid soap
Moisturizer
Toothpaste
Lotion
Cosmetics
 Pharmaceuticals

Functioning
Several types of pumps and dispensing systems have been developed.  Some of the pumps are similar to those of spray bottles.

Examples