Brønsted-Lowry Acid Identification

Consider the reaction represented by the equation below. $\text{CH}_3\text{COOH} + \text{H}_2\text{O} \rightarrow \text{CH}_3\text{COO}^- + \text{H}_3\text{O}^+$ Which of the following best describes the role of CH$_3$COOH in this reaction?