[comboy]

It is used for several purposes, the most frequent of which is to mark the end of a declaratory sentence. (why are we doing this?)

[tremon]

I thought English uses PERIOD to verbally mark the end of a declaratory sentence, not DOT. That's probably where the confusion comes from.

[triplesec]

To be strictly accurate, English uses 'full stop', and American English uses 'period'.

[comboy]

I should have written "period".