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Usually when you use a mouse, you point the mouse at a part of the screen, and click with the left button. Sometimes you just point the mouse without clicking.
Click and drag is more complicated. You point at a part of the screen with the mouse, and press your 'click' finger down, but you do not lift it up to complete the click. Now move your mouse to another part of the screen still keeping your finger down. When you have got to the second position, lift your finger.
There are two reasons to do this:
Sometimes the screen or a program will let you move things this way. You start the click and drag by pointing to an object and click keeping your finger down. Then move the mouse to where you want it, and lift your finger. The object will jump to the new position.
You can also high-light this way. Point to the start, and click and drag to the end. In between will change colour to show which piece has been high-lighted. High-lighting doesn't do anything, it just selects a part of the screen, such as some writing, to do something to, such as copy and paste. This type of click and drag also works if you start at the end, and move the mouse to the start.