'Later' means "at a later time"; 'latter' means "the second of two" things just mentioned.
"Later" is a time adverb: it describes when something happens, in the future relative to now or another moment. "See you later."
I'll call you later, I'm in the middle of something right now.
We can talk about the budget later this week.
She showed up two hours later than she said she would.
"Latter" is an adjective referring to the second of two items just mentioned ("the former... the latter..."). It has nothing to do with time.
You can choose pizza or sushi, I'd go with the latter.
Of the two candidates, the latter had more experience.
The article discusses both theories, and it favors the latter one.
Common mistake
"See you latter" is a very common spelling mistake, people confuse it because the words look so similar. For goodbyes and time, it's always "later" (with a single "t", not the doubled "tt").
Trick to remember it
"Later" is about the clock, think of the simple time-related word. "Latter" is used alongside "former" (the first one): "the former, the latter" is a fixed pair, like "the first one, the second one".
Quick rule
Is it about time, "at a later moment"? "Later". Does it refer to the second of two things just mentioned? "Latter".
Did you know?
"Later" and "latter" actually share the same root: both come from Old English "læt" (slow, late), the origin of "late". Over time, "later" specialized to mean time (the comparative of "late") and "latter" specialized to mean order/sequence (the second of a list), though etymologically they're close cousins. That's why they sound so similar, it's not a coincidence, it's shared history.
Exercise 1 · Pick the right one
I have a meeting right now, can we discuss this _____?
Exercise 2 · Pick the right one
We considered two cities for the new office: Madrid and Lisbon. We chose the _____ because of lower costs.
Exercise 3 · Form the word
One means to receive or agree to something, the other means to exclude or not include.
'Advice' is the guidance you receive (noun); 'advise' is the act of giving that guidance (verb).
'Affect' is the verb meaning to influence something; 'effect' is the noun meaning result or consequence.
'Aisle' is the walkway between rows of seats or shelves; 'isle' is a small island.
Bryan López
Founder of SpeakUP Academy