Minecraft wiki entry for Installing_a_snapshot, associated text: By default, you can choose and play release versions of Minecraft, e.g. 1.14.x, 1.15.x, 1.16.x and so forth. Also available are the development snapshots for the upcoming release, or for the most recent release if snapshots haven't begun yet for an upcoming release. Usually, only the last snapshot in per week is available, except for the most recent week, in which they're usually all available. Keep in mind that the exact list of snapshots available may vary, as it is at the discretion of Mojang which snapshots are listed. Snapshots are newer versions that have not been released as an update and are still a work in progress. Players can view said snapshots as well.