"Hotpicszip" refers to a common file format or naming convention often used for sharing bulk collections of images, typically within specific online communities.
Always ensure the source is trustworthy before downloading and extracting zip files, as they are a common way to distribute malware. Zip and unzip files - Microsoft Support
Professional space agencies often offer zip downloads of their Top 100 Images for educational or wallpaper use. Managing Zip Files
If you encounter a "hotpics.zip" file, you will need tools to open it:
You may need a dedicated app like Files by Google or the built-in Files app to uncompress the folder.