Adobe Photoshop Interface/Welcome Screen

As you can see in the pictures, There are 5 rectangles which are named as A,B,C,D and EWhen You open the Adobe Photoshop,the first thing you see is the same as you can see in the above picture.

1.Rectangle (A) 

This is called the Toolbar. In this bar all the tools are availble.

2.Rectangle (B) 

The rectangle B is called the Menu bar

3.Rectangle (C)

This is called the Option Bar

4.Rectangle (D)

This is called the Palettes.

5.Rectangle (F)

This is called the Panel Groups. In this Panel Group, There is  1.Layer panel, 2. Channel Panels and 3. Path Panel