later
adverbat a time after now or after something else
Later = late: after now.
They look alike, but only latter points back at the second of two things already mentioned.
Quick answer
Later means at a time after now. Latter means the second of two things you just mentioned.

at a time after now or after something else
Later = late: after now.
the second of two things already mentioned
The latter is the last of the two.
| Word | Type | Means | Example | Common mistake |
|---|---|---|---|---|
| later | adverb | at a time after now or after something else | I'll call you later. | |
| latter | adjective and noun | the second of two things already mentioned | I like tea and coffee, but I prefer the latter. |
adverb
Examples
I'll call you later.
She arrived two hours later.
Common mistake
Not: See you latter!
Say: See you later!
A time after now is later.
adjective and noun
Examples
I like tea and coffee, but I prefer the latter.
Of the two options, the latter is cheaper.
Common mistake
Not: Of tea and coffee, I prefer the later.
Say: Of tea and coffee, I prefer the latter.
The second of two things is the latter.
Read the sentence, then choose the word that fits.
Write or say two sentences, one with each word, in a real conversation.