It is either for a list or to separate two sentances
A colon typically comes before a list or explanation. It is placed at the end of the sentence, followed by a single space and then the first item or explanation.
colon colon
You should not capitalize a sentence fragment following a colon.
a colon(:)
Colon is actually punctuation mark which indicates something. It is ":". If you really want a sentence with the word, "He lost a mark because he used the semi-colon instead of a colon." Also, according to biology, colon is the main part of the large intestine.
It depends on the style guide you follow. Some style guides recommend capitalizing the first letter after a colon if the text following the colon is a complete sentence. Others suggest using lowercase unless the text is a proper noun or begins a complete sentence.
You use one space after a colon or semi-colon.
A colon is typically used to introduce a list, a quote, or an explanation. For example, in the sentence "She brought three items to the picnic: sandwiches, fruit, and drinks," the colon correctly introduces the list of items. Always ensure that the part before the colon is a complete sentence.
Such an interruption requires a comma, you may wish to use a Colon or a Semi Colon depending on the construction of the sentence
A colon causes a pause in a sentence. I hope that was simple enough for ya.... sarcasum intended.
As with a comma, a semi-colon (;) separates items (i.e., a list or set of ideas, etc.) within a given sentence. Therefore, it is one sentence.
If a colon is required in the sentence in which the abbreviation occurs, there is no rule against a period preceding the colon.