A Smart Object is a type of container that holds multiple layers within Photoshop. It is a Photoshop layer that contains all the same image information of a normal layer but allows you to perform non-destructive edits. Smart Objects preserve an images source content with all its original characteristics, enabling you to perform non-destructive editing to the layer. Here are some key features of Smart Objects:

• Non-destructive editing: Smart Objects allow you to do non-destructive editing, making changes without overwriting your original image.

• Multiple layer editing: You can edit multiple layers at once with Smart Objects.

• Compatibility: Smart Objects are compatible with dozens of different features in Photoshop.

• Filters and effects: You can apply non-destructive filters to a Smart Object.

• Transformations: You can perform non-destructive transformations to an image, such as resizing, rotating, skewing, and distorting perspective, without losing any of the original image quality.

• Vector images: You can embed vector images from Illustrator, and similar applications, without needing to change to pixels first.

• Direct editing: You can directly edit a Smart Object by double-clicking on the layer.

Smart Objects are useful for photographers and graphic designers who want to preserve and protect their work. They allow you to make safe edits and experiment with your work without overwriting your original image. However, Smart Objects take up more space than ordinary layers, and having too many of them can slow down Photoshop and make file sizes much larger.