a school teaching mechanical and industrial arts and the applied sciences
"After graduating from tech, she worked immediately as an apprentice machinist at the local factory."
Technology.
"The new tech has made it possible to edit photos directly on my phone."
In plain English: Tech is short for technology, which refers to all the tools and machines people use to solve problems or make life easier.
"He keeps all his latest gadgets and devices in the tech corner of the store."
The word tech is a clipping derived from technology, technician, and technique. It entered common usage as a shortened form to refer specifically to the field of modern science and engineering.