Help messages assist users to correctly fill out a form.
There are two kinds of help messages that you can set up for the users of your forms:
Context-sensitive hover help and error messages are displayed when the user hovers over an item in your form. Each field on the form can have its own error message.
Accessibility messages are played by screen reading software to describe each item on a form to visually impaired users. The text entered in this option is not displayed in the when the user views the form, but when the focus moves to the item, an active screen reader will read this message. Note that screen readers vary in behavior, and may provide additional information about the item.