What is .NET Framework

The .NET Framework is a Software Framework that run on the Microsoft Windows.

The .NET Framework includes a large library. It supports several programming languages which allows language interoperability. The .NET library is available to all the programming languages that .NET supports. The Base class library and the CLR(Common Language Runtime) together constitute the .NET Framework.

Base Class Library : The .NET framework's Base Class Library provides user interface, data access,database connectivity, cryptography, web application development, numeric algorithms, and network communications. The class library is used by programmers, who combine it with their own code to produce applications.

.NET Framework

During the execution of the program this MSIL is converted to the native code or the machine code. This conversion is possible through the Just-In-Time compiler. During compilation the end result is a Portable Executable file (PE). 

ADO.NET : ADO.NET is the new database technology of the .NET platform, and it builds on Microsoft ActiveX Data Objects (ADO).

ADO.NET is an integral part of the .NET Compact Framework, providing access to relational data, XML documents, and application data. ADO.NET supports a variety of development needs. You can create database-client applications and middle-tier business objects used by applications, tools, languages or Internet browsers.

ADO.NET