how did the term for preserving get to be canning when we put things up in jars?

Question

how did the term for preserving fruits and vegetables get to be canning when we use glass jars under heat and pressure?

Answer 1

This is a very informative article on the history of preserving fruit and explains the various prototypes that were used before the process was perfected.

Answer 2

Because the first methods using heat sterilization did use metal cans.

Answer 3

because the food processing undergoes the strelization process for sanitation.