Customer service refers to the support and assistance provided to customers before, during, and after their purchase or interaction with a company. It involves addressing customer inquiries, resolving issues, and ensuring customer satisfaction. Effective customer service is crucial for building strong relationships with customers, enhancing brand reputation, and fostering loyalty. It encompasses various channels such as phone, email, live chat, and social media, and requires excellent communication, problem-solving, and interpersonal skills. Exceptional customer service can differentiate a business from its competitors and contribute to long-term success.