What is IL Code, CLR, CTS, CLS & JIT?

I am "Akash Jain" working in IT Industry from last 6 years. From the beginning of my career I worked with C# for both windows and web application. In my short career I worked for 2 Major ERP Applications, e-commerce applications, CMS based applications and also few static websites.

I am a MCP for web application for ASP.NET 4.0. I have also done PMP training as project management is one of my interest area.