What is a Smart Object in Photoshop?

A Smart Object in Photoshop is indeed a layer that preserves the original image quality. When you convert a layer to a Smart Object, it allows for non-destructive editing, meaning that you can resize, transform, and apply filters without permanently altering the original image data. This preservation of quality is crucial especially when you wish to perform multiple edits or adjustments to an image while retaining its original pixel information.

This capability is particularly useful when you need to scale images up or down without risking pixelation or loss of detail. Smart Objects also allow you to apply effects and make changes that can be adjusted or removed later, maintaining the integrity of the source material throughout the editing process.

In contrast, other options describe characteristics that do not align with the functionality of Smart Objects. For instance, while some layers may affect file size or relate to text, they do not encompass the full implications of preserving original image quality as Smart Objects do. Additionally, adjustment layers serve specific purposes in altering colors or tones, but they do not retain the original image data in the same way.