Template question

[Espresso]

Hi everyone,

I have two questions about the use of a template declaration.
This is the code:

using namespace std;
template <typename DataType>

class Graph
{
    public:
    DataType Data(int k) const; 

    private: 
{;

First question: What is the meaning of template <typename DataType> ??
Second question: In the class Graph this DataType is used to define Data(int k) const; What is the meaning of this?

[Espresso]

someone an idea??

[z05DSL3A]

http://www.cplusplus.com/doc/tutorial/templates.html