What Is The Difference Between Pygame.draw.rect And Screen_surface.blit()?

I am trying to make a red rectangle move to the right and by using pygame.move.rect or .blit, I Am able to accomplish the same thing. I am able to display the red rectangle and m

Solution 1:

Why are there 2 functions that basically do the same thing.

No, they do not the same thing. While pygame.draw.rect draw uniform colored rectangles, pygame.Surface.blit is a method of pygame.Surface and is used to draw bitmap images.

See pygame.draw.rect:

rect(surface, color, rect) -> Rect
Draws a rectangle on the given surface.

See pygame.Surface.blit

blit(source, dest, area=None, special_flags=0) -> Rect
Draws a source Surface onto this Surface

In your case, it looks like they're doing the same thing because your Surface object is evenly filled with one color.
The behavior changes completely when you load a bitmap image with pygame.image.load. You cannot draw an image using pygame.draw.rect, but you can use blit.

When to use pygame.draw.rect, see:

Pygame Drawing a Rectangle

When to use blit, see:

What is a good way to draw images using pygame?

Solution 2:

blit(image, (left, top)) - Draws image to the screen at the given position.The function accepts either a Surface or a string as its image parameter. If image is a str then the named image will be loaded from the images/ directory.

draw.rect(rect, (r, g, b)) - Draws the outline of a rectangle. Takes a rectangle.

Solution 3:

So just to clarify,

Use blit for image and rect for rectangle with 1 colour.