# JAX Expressions (Jaxpr)

This lesson will provide an introduction to JAX Expressions.

## We'll cover the following

We just discussed how trace objects are used to preempt the sequence of operations outlined in the function. These extracted JAX expressions are discussed in this lesson.

## Lambda expressions

Before beginning the JAX expressions, it is helpful to have a quick introduction of **Lambda expressions**.

Lambda expressions are usually used for **anonymous functions**. Defining them is pretty easy:

- Specify the
keyword`lambda`

- Outline the
**parameters**(enclosed by).`:`

- Specify the
**expression body**.

For example, a simple Lambda expression to calculate the circumference of a circle is:

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