Q.List and briefly explain any four common controls used to build a front-end form.

A form is assembled from standard building blocks, each with a clear purpose.

A front-end form is built from standard controls, each with a defined job. Four common ones:

1. Label — displays a piece of fixed text, such as a caption beside an input box (for example 'Customer Name'). The user cannot type into it; it only guides the user.
2. Text box (text field) — a box in which the user types a single line of data, such as a name or a number. It is the most common way of taking input.
3. Button — a control the user clicks to make something happen, such as 'Save', 'Search' or 'Delete'. Clicking it triggers an event handler that runs the required code.
4. List box / combo box (drop-down) — offers a list of items to choose from (for example a list of cities), so the user selects a valid value rather than typing it, which prevents spelling errors. …

Naming controls without saying what each does — the question asks you to explain each. Also, do not confuse a radio button (choose exactly …