Action inputs consist of two key elements: an input field and a submit button. Their primary function is to validate and process the data entered by users to determine its correctness or relevance for a specific purpose. Designers employ these inputs when they need to examine data within a single input field.

You'll come across action inputs in various contexts. For instance, during online checkout, when users input a coupon code and click "Apply," or alongside the "Search" or "Send" buttons. They help save screen space and simplify the interaction process, reducing any potential difficulties or confusion for users.