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Accessible forms (labels and instructions) 0:49
A 49-second explainer of Accessible forms (labels and instructions), narrated over the same demo you can try yourself.
Try the interactive Accessible forms (labels and instructions) demo
What this video covers
An accessible form gives every control a real, programmatically-associated label and clear instructions, so a screen-reader user hears what each field is for before they fill it in. Without that, the form may look fine but announces as a row of nameless "edit text" boxes - usable by sight, a guessing game by ear.
Turn the labels off and listen to what the screen reader gets: "edit text… edit text… combo box" - nameless boxes, no idea what any of them want. Turn them on and the same fields announce "Full name, edit text", "Email address, edit text" - suddenly fillable by ear. The inputs never changed; only whether their names were exposed to assistive tech.