What is the difference between LINQ and lambda?

LINQ and Lambda expressions are two distinct concepts within C#.

1. LINQ (Language-Integrated Query) is a technology that integrates a query language into .NET programming languages. It allows developers to use SQL-like syntax to query and manipulate various data sources such as collections, databases, XML, etc. LINQ provides a set of standard query operators (such as Where, OrderBy, Select, etc.) that can be used through method chaining or query expressions. LINQ performs type checking at compile time and offers strong typing for querying functions.
2. A Lambda expression is an anonymous function that can be created and used without defining a named method. Lambda expressions offer a more concise and flexible way to define and use functions. They can be passed as parameters to other methods or delegates, and can be used in LINQ queries. Lambda expressions are commonly used to provide behavior (such as filtering, sorting, transforming, etc.) for LINQ queries.

In summary, LINQ is a querying technique that offers a set of standard query operators and syntax for querying and manipulating data sources; while Lambda expressions are anonymous functions used to provide behavior for LINQ queries. When used together, they make LINQ queries more flexible and concise.