This informal meaning refers to an algorithm used to calculate, sort, predict, recommend, or automate a task.
The app uses an algo to rank the results.
Developers adjusted the recommendation algo.
In finance, this meaning refers to software that automatically makes or executes trading decisions according to programmed rules.
The algo placed hundreds of trades in seconds.
Market volatility triggered several trading algos.
This foreign-language meaning refers to an unspecified object, fact, event, or amount.
In Spanish, quiero algo means I want something.
Algo can also mean something in Portuguese.