Language Integrated Query (LINQ) is a feature in Microsoft .NET that allows developers to write queries directly in their programming languages, such as C# or VB.NET. This integration simplifies data manipulation by enabling developers to work with various data sources, including databases, XML, and collections, using a consistent syntax. LINQ provides a set of standard query operators that can be used to filter, sort, and group data. By using LINQ, developers can write more readable and maintainable code, as it combines the querying capabilities of SQL with the power of programming languages, making data access more intuitive.