From the beginning of time, humans have had biological ways to adapt to the environment with the use of biological tools integrated in the body, allowing to react to potential dangers. These are called the senses.
Sense is the ability to perceive internal and external stimuli using specific organs. Each sense is formed by a group of specialized cells that detect «feelings» through receptors.
Generally, it is considered that humans have five senses: hearing, sight, smell, touch and taste.