HackerRank is an online platform designed for programmers to practice coding skills and prepare for technical interviews. It offers a variety of coding challenges and competitions across multiple programming languages, allowing users to improve their problem-solving abilities and showcase their skills to potential employers. In addition to coding challenges, HackerRank provides resources for companies to assess candidates through coding tests and technical interviews. This helps employers find qualified candidates by evaluating their coding proficiency in a structured environment, making the hiring process more efficient and effective.