The inner disk is a research area that focuses on studying the region of a disk surrounding a central star within a planetary system. This inner region is typically closer to the star and is usually composed of smaller dust and gas particles. Researchers study the inner disk to understand the formation and evolution of planets, as well as other processes that occur in this region, such as dust grain growth and planet migration. By studying the inner disk, scientists aim to gain insights into the mechanisms that drive planet formation and the dynamics of planetary systems.