A colon is used to connect two sentences when the second sentence expands, illustrates, explains, summarizes, or sharpens the first. Both sentences should be complete, and their content should be very closely related.
Example:
This girl has two favorite hobbies: watching movies and seeing how long she can hold her breathe.
The United Arab Emirates (UAE) central bank (UAECB) and the Saudi Arabian Monetary Authority (SAMA) have announced that the interbank digital currency they are co-developing will be called 'Aber.'
A spreadsheet is an interactive computer application for organization, analysis and storage of data in tabular form. This software allows users to store data in rows and columns.