A container that organizes and groups related files together. Like a digital filing cabinet drawer where you keep similar documents organized.
You might have a 'Photos' folder containing all your pictures and a 'Work' folder containing all your business documents.
“Folder” is a general computing concept used to organize items. Cloud providers use similar ideas, but the exact feature depends on the product: object storage often uses prefixes that look like folders, while file storage and document services provide real directories/folders.