The "solar neighborhood" refers to the region of space surrounding our Sun within a radius of about 50 to 100 light-years. This area contains a variety of stars, including some that are similar to our Sun, as well as different types of stars, such as red dwarfs and white dwarfs. In addition to stars, the solar neighborhood includes stellar systems, planets, and interstellar matter. It is an important area for astronomers studying the formation and evolution of stars and planetary systems, as it provides a close-up view of the diverse environments in which stars exist.