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STL provide different types of algorithms that can be implemented upon any of the container with the help of iterators. Thus now we don’t have to define complex algorithm instead we just use the built in functions provided by the algorithm library in STL.

As already discussed earlier, algorithm functions provided by algorithm library works on the iterators, not on the containers. Thus one algorithm function can be used on any type of container.

Use of algorithms from STL saves time, effort, code and are very reliable.

For example, for implementing binary search in C++, we would have to write a function such as:

`bool `**binary_search**( int l , int r , int key ,int a[])
{
if(l > r)
return -1;
else
{
int mid=(l+r)/2;
if(a[mid] == key)
{
return true;
}
else if(a[mid] > key)
{
return **binary_search**(l, mid-1, key, a);
}
else if(a[mid] < key)
{
return **binary_search**(mid+1, r, key, a);
}
}
}

Note that the above function will work only if the array is of intergers and characters.

But in STL we can just use the `binary_search()`

provided by the algorithm library to perform binary search. It is already defined in the library as :

`return binary_search(a, a+a.size())`

Plus the above function will work on any type of container.

- Sorting Algorithms
- Search algorithms
- Non modifying algorithms
- Modifying algorithms
- Numeric algorithms
- Minimum and Maximum operations.