What is the difference between c# internal and public?

In C#, internal and public are access modifiers used to control the access level of members (classes, methods, properties, fields, etc.). The difference between them is as follows:

1. Internal means that members are visible to other types and members in the same program assembly. In other words, internal provides access permission at the assembly level. If a member is marked as internal, only other types and members within the same assembly can access it. Types and members from other assemblies cannot access internal members.
2. Public means that members are visible to all types and assemblies. In other words, public is a level of accessibility that allows any type or assembly to access the member.

In short, internal is the access level at the assembly level, while public is the access level at the global level. Internal members can only be accessed within the same assembly, while public members can be accessed anywhere.