A call to action is a way of inviting or instructing your audience to perform a specific action that you want them to take. It can be a short statement, a button, a link, or a piece of writing that provides compelling reasons or benefits for taking the action. A call to action can also be a way of asking or encouraging people to take action about a problem. For example, you can use a call to action to ask your readers to subscribe to your newsletter, buy your product, contact you for more information, or join a social movement.