A modal can refer to different things depending on the context. Here are some definitions:
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Modal window: In user interface design for computer applications, a modal window is a graphical control element subordinate to an applications main window. A modal window creates a mode that disables user interaction with the main window but keeps it visible. Modal windows are intended to grab the users full attention and are used to command user awareness and to display emergency states.
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Modal verb: A modal verb (also called a modal auxiliary verb) is used along with a main verb to express possibility, ability, permission, or necessity. For example, "can" and "may" are modal verbs. Modal verbs are used along with a main verb to indicate ability, necessity, possibility, and permission. In sentences containing modal verbs, the main verb typically takes the infinitive form. Modal verbs come before main verbs and never change form.
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Modal in web design: A modal is a web page element that displays in front of and deactivates all other page content. To return to the main content, the user must engage with the modal by completing an action or by closing it. Modals are often used to direct users’ attention to an important action or piece of information on a website or application. They can take many forms, including contact forms, email signups, and brief surveys. Modals are polarizing among designers and users alike. Many find value in their ability to quickly bring attention to something essential, while others regard them as an unwelcome interruption to the user experience.
