In simple words, a carrier is someone or something that carries, moves, or holds something else from one place to another. The word is used in many different everyday contexts with the same basic idea of carrying. In the HVAC world, Carrier is a well-known American brand that makes air conditioners, furnaces, and heat pumps that carry cool or warm air throughout your home to keep you comfortable, founded by Willis Carrier who invented modern air conditioning in 1902, and today Carrier also owns Bryant and Payne brands. In transportation, a carrier is a company or person that carries things, such as a mail carrier who carries letters to your house, an airline carrier like United that carries passengers on planes, or a shipping carrier like UPS that carries packages. In medicine, a carrier is a person who has germs or a gene inside them but does not get sick themselves and can still carry it to others. In phones, your wireless carrier like Verizon or T-Mobile carries your calls and internet. So at its core, a carrier is anything that carries something else.
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