HTML (HyperText Markup Language) is the most basic building block of the Web. It defines the meaning and structure of web content
CSS is a stylesheet language used to describe the presentation of a document written in HTML or XML CSS is among the core languages of the open web
Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible.
C# is a type-safe enables developers to build many types of secure and robust applications that run in .NET. C# has its roots in the C family of languages.