C#: What is the difference between IOptions and IOptionsSnapshot?

1// IOptions
2public class MyService(IOptions<Settings> options)
3{
4    var timeout = options.Value.Timeout;
5}
6
7// IOptionsSnapshot
8public class MyService(IOptionsSnapshot<Settings> options)
9{
10    var timeout = options.Value.Timeout;  // Fresh each request
11}