It can be used for improving life e.g.; Electricity, Engines, Mechanisation of Agriculture, The Internet, Sanitation.
It can also be used for controlling life e.g.; Propaganda, Mechanisation of War, Internet Addiction.
"If you can't control the technology, then it's controlling you" - Open Source Enthusiast
In many ways, humans exist for tech rather than the opposite. "Tech" in the abstract exists in the collective minds of humanity, and will endure as long as humanity endures, even when individuals perish. When an individual contributes to tech it is passed down through the ages, a small form of immortality.