Glossary
Utility
In one line: All agent abilities: smokes, flashes, mollies, traps, recon, walls, heals.
What it means
Utility is the word for every ability that is not shooting. Each agent has four: some are bought every round, one recharges by itself, one is the ultimate. Together, utility is what makes VALORANT more than an aim game.
Utility does three things: gathers information, controls space (blocking vision or passages) and wins duels (blinding, flushing out, damaging). The question before using one is always the same: what is it for right now, and who takes advantage of it?
An example
On attack your team uses a drone to see who is on site, a smoke to cover the entrance and a flash to blind whoever is watching. Three pieces of utility, three different jobs, all in service of the entry.