There is no one Linux. To have, install, and use Linux, one must choose one or more distributions, often called distros, flavors, or flavours. Hundreds exist, and more emerge every month. Each has merits, and often weaknesses, as most exist for specialized uses. It is easy to make new ones, as Linux is open source software. Distributions are listed in this category and many subcategories. On this page, categories are arranged in three groups and levels: 1) Top group: issues spanning multiple unrelated distributions. 2) Middle group: types or classes of distribution. 3) Bottom group: specific distributions, individual instances; there is at least one distribution of this name/type, with its own category.