What is the difference between the properties count and capacity in collections or data structures?

In collections and data structures, the properties Count and Capacity have different meanings:

• Count — the number of elements currently contained in the collection.
• Capacity — the number of elements the collection can hold without needing to resize.

For example, in List<T> in C#:

List<int> numbers = new List<int>(10); // Capacity = 10
numbers.Add(1);
numbers.Add(2);

Console.WriteLine(numbers.Count);    // Outputs 2
Console.WriteLine(numbers.Capacity); // Outputs 10

If the number of elements exceeds Capacity, the collection will automatically increase its size, allocating more memory.