Glossary

An air-conditioner is a system that controls humidity and temperature within in a space that is typically warm. 

Air-conditioners are used to maintain cool temperatures in places that are usaully warm. 

Humidity is the amount of water moisture in the air.

Humidity makes your surroundings feel muggy and sticky. 

Ex: Right before it rains on a summer day, humidity provides that thick and muggy feeling to the air. 

Temperature is how hot or cold something is. 

Temperature can be a form of measurement when "taking someone's temperature".