LINQ Lambda Expression is a nameless function in LINQ. It keeps the syntax simple. Though lambda expressions are not as readable as LINQ queries, they are just as significant and transform to lambda internally. When you employ the LINQ lambda expression as an expression, its scope is limited. After that, you won't be able to use Lambda Expression.

The phrase "Lambda expression" comes from the term "lambda" calculus, a mathematical notation used to define functions. As the executable element of a LINQ equation, Lambda expressions convert logic in a way that can be passed on to the data source easily at run time. Lambda expressions, on the other hand, aren't confined to LINQ applications.

The type of Lambda Expression is determined at build time. You have a bracket (), which holds the input parameter on the left-hand side of the aforementioned lambda expression.

The name of the criterion can be anything, and ahead of it (=>) is an Equal to (=) followed by a greater than (>) symbol, which is used to send or pass the parameter from left to right side, and you execute tasks on the right-hand side using the input parameter that you will pass from the left-hand side parameter.