What is Precision Engineering?

While browsing the Internet, I stumbled upon the term 'Precision Engineering'. I wasn't familiar with the term, so decided to find out more information about it. Upon search, I found the following information which I think you might find useful -

1. Precision Engineering is a sub-branch of various major engineering disciplines like Electrical & Electronics Engineering, Mechanical Engineering & Optical Engineering.

2. It's mostly about design & study of machines, fixtures and structures with very low or ultra-low tolerance.

Precision engineering helps in predicting the nanoscale motions. Machine tool errors obey cause-and-effect relationships and they are not random in nature.