Objects are individual files or data that you store in an R2 bucket. Each object is identified by its key, a string like images/photo.png.
R2 uses a flat storage structure. There are no real directories or folders. The / character in an object key is used as a delimiter to group objects by prefix.
The R2 dashboard groups objects that share a common prefix into folders when the View prefixes as directories checkbox is selected. For example, objects with keys logs/jan.csv and logs/feb.csv appear under a logs/ folder. These folders are a visual grouping and do not exist as separate resources in your bucket.
For information on R2 Workers Binding API, refer to R2 Workers API reference.