What tag is used for creating a checkbox in a form?

The tag that is used for creating a checkbox in a form is the input element with the specific attribute type set to "checkbox." Using <input type="checkbox"> allows users to select one or more options independently of each other, which is essential for situations where multiple selections are allowed.

This approach provides clarity to both the user and the browser, ensuring that the form captures the intended state of the checkbox. The input tag is versatile and utilized for various input types such as text, radio buttons, and checkboxes. The specificity of the type attribute here indicates that the input should behave as a checkbox, differentiating it from other input types.

Other options listed do not represent the correct method for creating a checkbox. For instance, <input type="radio"> is specifically for radio buttons, and <checkbox> is not a valid HTML tag. Additionally, <form type="checkbox"> is incorrect because the type attribute cannot be used with the form tag in this context.