This question requires you to know your strengths and how you will fit into the firm's culture and help the business grow. Answering this question does not require you to brag about your accomplishments. Focus on how you can help this firm. Perhaps you bring a certain background to the practice that expands their representation. Or you can discuss any connections you have with the firm if you networked with other attorneys before applying. Be authentic and share what you want them to focus on when they look at your resume and interview in their discussions on who to hire.