Immersion: every grain soaks in all the water.
Instead of water passing through, the coffee steeps in it. Extraction depends mostly on time and grind, so it's forgiving — and easy to repeat.
What it is
Brewing by letting the coffee steep in all the water at once — as in a French press or an AeroPress — instead of letting water flow through it.
Why it matters
Extraction depends mostly on grind and time, and much less on pouring technique, so immersion is forgiving and easy to repeat.
In practice
Pour all the water quickly, make sure everything is wet, then let time work. To change the taste, change the steep time or the grind.