SFML Book chapter 2 question

[Michalus]

I read at this moment the sfml development book.
I am at chapter 2 before the headline Error handling.
There stand at the TextureHolder class, two get methods
first:

sf::Texture& get (Textures::ID id);
 

second:

const sf::Texture& get (Textures::ID id) const;
 

But I dont understand the sense of the second method.
The methods do  actually almost the same.

[eXpl0it3r]

Yes they do almost the same. So what's the difference? What do those const mean?

[FRex]

http://www.parashift.com/c++-faq/const-overloading.html