A form is a section of a document that has form controls, such as text fields, buttons, checkboxes, range controls, or file selectors. A user generally "completes" a form by modifying its controls and by providing data that can then be sent to the server for further processing (e.g. returning the results of a search or calculation). Forms can perform login tasks, upload files, autocomplete search queries based on a dictionary or database, and are widely used on social networking platforms for logging user performance and activity. As web forms interface both access and input mechanisms to digital databases, they are prone to various types of malicious usage and exploits.