A colon looks like this “:”
When to Use a Colon
To introduce a list
When introducing a list, use a colon, especially if the introduction contains phrasing such as “the following” or “as follows.”
Before explanatory text
Use a colon to indicate that the initial clause will be further explained or illustrated by information that follows the colon.
Note that the colon serves as a substitute for phrases such as “in other words,” “namely,” or “for instance.”
After an introduction to a statement or question
When Not to Use a Colon
To introduce a figure or a table
In a list introduced within a sentence
Do not use a colon before a list introduced by “includes” or “are” within a sentence.