Christmas.zip is a release file of the Minecraft resource pack Christmas Covid Party Pack 2020, made for Minecraft 1.16.4. It was published on December 18, 2020 and is 29.4 MB in size. For the full description, screenshots and every other version, visit the Christmas Covid Party Pack 2020 resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.