A colon is used to give emphasis, present dialogue, introduce lists or text, and clarify composition titles. Emphasis—Capitalize the first word after the colon only if it is a proper noun or the start ...

Supermarkets: barbeque sales are 800 per cent up this summer. Note also that in a more formal English style colons are frequently used to introduce direct speech: A spokesman for the British ...

In this film Farmer Frank learns about colons and semi-colons whilst egg collecting, unaware that his ostriches have laid a trap for him… This clip is from the series Grammar for 11-14 year olds.