What is Span data structure that announced in C# 7.2?

Question

I'd seen Span<T> data structure that announced in DotNet Conf 2018 for C# language, it seems very look like to array or List data structures. Can anyone describe what is exactly Span and what is differences between with other collections?

Answer 1

I have found a very helpful article in Adam Sitnik's blog:
https://adamsitnik.com/Span/

Span<T> (previously called Slice) is a simple value type that allows us to work with any kind of contiguous memory:

Unmanaged memory buffers
Arrays and subarrays
Strings and substrings
It ensures memory and type safety and has almost no overhead.