The custom shapes can be created using the pen tools within Photoshop, you can create them via work paths, you can use type to create custom shapes by converting a letter or more into a custom shape. Personally, I use Illustrator to create custom shapes and copy the shapes to Photoshop and then use the define custom shape command (found in the edit menu)
Tomas Knoll is father of Adobe Photoshop.
1990
Anchor points which defines shape, fill and in Photoshop you can change Layer Style which is created from layer effects: Drop Shadow, Bevel..
it was created by Cher in 1997 following photoshop in 2001
To use the free form crop tool in Photoshop to create a custom shape for your image, simply select the tool from the toolbar, then click and drag to draw the desired shape around the area you want to keep. Once you have the shape you want, release the mouse button to crop the image to that shape.
Tools are basically actions or tasks that you can perform in Photoshop like adding text to image or draw shape. Every tool have its own icon for to recognize and activate it from Toolbox. Toolbox is located on left side of Photoshop window.
It is object (lines and curves) or shape you can drawn or use existing pre-defined vector shapes from Custom Shapes in Toolbox.
It is solid color, gradient or pattern line around type or shape or layer.
Adobe launched the first version in 1990
There is no such option in Photoshop. If you mean Vector Photoshop shapes then the shapes can be used for infinite things in Photoshop such as layers, masks, as frames, as a source for selections, as a source for actual brushes, for patterns, for exporting to other applications, used in shape blurs, used as cookie cutters in Photoshop elements. Illustrator vector brushes exist as do expression and Xara vector brushes and many others but sadly, as yet, Photoshop has no vector format brushes.
Your Shape was created in 2009.
I think you mean PSD, which stands for Photo Shop Document. It is the name of the file extension created when you create or edit a multi-layered image in Photoshop.