Access specifiers (or access modifiers) are keywords in object-oriented languages that set the accessibility of classes, methods, and other members. Access modifiers are a specific part of programming language syntax used to facilitate the encapsulation of components.
There are 5 access modifiers.
Private: Accessible only within the class.
Protected: Accessible within the class and its derived classes.
Internal: Accessible anywhere within the current project or assembly.
Protected internal: Accessible with current project and derived classes.
Gravatar (an abbreviation for globally recognized avatar) is a service for providing globally unique avatars which was created by Tom Preston-Werner. On Gravatar, users can register an account based on their email address, and upload an avatar to be associated with the account. Gravatar plugins are available for popular blogging software; when the user posts a comment on such a blog that requires an e-mail address, the blogging software checks whether that e-mail address has an associated avatar at Gravatar.