When saving graphic projects created with the best-known Photoshop software, the manufacturer Adobe offers its own PSD format (Photoshop Document). This is characterized by the fact that it secures all information about layers, channels, or vectors, which makes subsequent editing possible. For example, layers can be added, duplicated, scaled, moved, removed, and customized. In a single PSD file, several layers, as well as the respective image data can be stored loss-free. The Adobe image file format is especially practical when it comes to graphics with a high recognition value such as logos, banners, etc., which are to be adapted quickly across different platforms and display sizes.
By default, images in PSD format can only be opened with Adobe Photoshop without restrictions, although exchanging files between applications on different operating systems (such as Windows or macOS) works without problems. The graphic file format can, therefore, be described as system-wide, in a sense. PSD primarily acts as a storage format during the processing procedure. However, for output to the web, the file should be converted to the PNG format or alternatively to JPG before being uploaded to the server, since the loss-free saving of the image data and all the layers enable effective post editing, but also bring a large amount of data along with it. In order to convert a PSD graphic, you can use a simple web tool like Zamzar.
Recommended application scenario: caching and editing of frequently used graphics, design templates.