Concept:
Salbutamol is a short-acting \\beta_2\-adrenergic agonist.
Step 1: Bronchospasm occurs due to contraction of bronchial smooth muscle.
Step 2: Salbutamol stimulates \\beta_2\-receptors in bronchial smooth muscle.
Step 3: This causes relaxation of bronchial smooth muscle.
Step 4: As a result, airways dilate and breathing improves.
Step 5: Therefore, salbutamol is used as a bronchodilator.
\[
\boxed{\text{Bronchodilator}}
\]