Business Intelligence Development Studio (BIDS) is a special version of Visual Studio that is used to develop projects for SSIS, SSAS, and SSRS.
The Business Intelligence Development Studio (BIDS) is a tool that Microsoft has released to create projects surrounding the Microsoft SQL Server tools. These tools include the Microsoft SQL Server Integration Services (SSIS), Microsoft SQL Server Analysis Services (SSAS) and Microsoft SQL Server Reporting Services (SSRS). Developers use the Visual Studio development platform to create these projects. Each SQL Server tool comes with an installation of Visual Studio (BIDS). You cannot get BIDS without having at least a developer copy of one of the Microsoft SQL Server tools.
For more about BIDS and its role in developing projects for SQL Server tools, go here: