Differance between Web Application and Web site creation in Asp.Net

Area	Web application projects	Web site projects
Project file structure	A Visual Studio project file (.csproj or .vbproj) stores information about the project, such as the list of files that are included in the project, and any project-to-project references.	There is no project file (.csproj or .vbproj). All the files in a folder structure are automatically included in the site.
Compilation	·    You explicitly compile the source code on the computer that is used for development or source control. ·    By default, compilation of code files (excluding .aspx and .ascx files) produces a single assembly.	·    The source code is typically compiled dynamically (automatically) by ASP.NET on the server the first time a request is received after the site has been installed or updated. You can precompile the site (compile in advance on a development computer or on the server). ·    By default, compilation produces multiple assemblies.
Namespaces	Explicit namespaces are added to pages, controls, and classes by default.	Explicit namespaces are not added to pages, controls, and classes by default, but you can add them manually.
Deployment	·    You copy the assembly to a server. The assembly is produced by compiling the application. ·    Visual Studio provides tools that integrate with Web Deploy (the IIS web deployment tool) to automate many deployment tasks.	·    You copy the application source files to a computer that has IIS installed on it. ·    If you precompile the site on a development computer, you copy the assemblies produced by compilation to the IIS server. ·    Visual Studio provides tools that integrate with Web Deploy (the IIS web deployment tool) to automate many deployment tasks.