Also open the Stroke panel, Window > Stroke, so we can easily access and alter our stroke options.
By clicking on the Brushes panel sub menu, go to Open Brush Library > Artistic > Artistic_Calligraphic. Here we can select from a range of brush types. These files may contain many different types of data required by Photoshop, such as multiple image layers, masks, notes etc. PSD file format is the default format that Photoshop uses for saving data.
PSD extension belong to Adobe Photoshop, possibly the most popular image editing tool in modern computing.