I want to develop a website & want to know which platform is best for security purpose. .Net OR Java??
.Net is a platform, Java is a multiplatform programming language. If you want to create a website in a .net language (you don't write code in .net, you write code in a language that uses the .net platform - languages like Visual Basic, ASP, C++ or C#). Most people don't use Java to write web pages. If you mean Javascript (a totally different language), you also have to use HTML, since that's what's seen by the user. (You'll need a server-side language like PHP) for any but the most trivial sites. Which is better? Without playing some games, a .net site will run only on a Microsoft server. HTML/CSS/Javascript will run on any web server.