What does Hermetically sealed container mean?

A container designed and intended to be secure against the entry of microorganisms and to maintain the commercial sterility of its content after processing. These containers prevent the passing of gases, air, and oxygen.

These seals are important in industries like healthcare and electronics. Another example of hermetically sealed containers are the containers in which the US Constitution, Declaration of Independence, and Bill of Rights are sealed in. There are various types of hermetic seals. One is epoxy hermetic seals, which are used to seal copper wires. Another type is glass-to-metal hermetic seals, which can handle higher temperatures.