Describes something that happens or is done without conscious thought, human intervention, or deliberate decision. Often used as an adverb with に.
ドアが自動的に開いた。
The door opened automatically.
彼は自動的にうなずいた。
He nodded automatically.
The contract renews automatically.
This app automatically saves the data.
After a set period of time, you'll be automatically logged out.