> ## Documentation Index
> Fetch the complete documentation index at: https://arize-ax.mintlify.site/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction to Arize AX and evals

> An introduction to Arize AX, why evaluation is foundational to improving AI applications, and how traces and evals work together.

Arize AX helps teams observe, evaluate, and improve AI applications. Every workflow it supports builds on two core concepts: traces, which record what your application did, and evals, which measure how well it did it.

## Introduction to Arize AX and evaluation

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An introduction to Arize AX and why evaluation is the foundation for building AI applications you can trust.

## Understanding traces and evals

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  <video src="https://storage.googleapis.com/arize-assets/doc-images/Learn/episode%202.mp4" controls />
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Traces capture every step your application takes; evals turn those records into measures of quality.

## Up next

<Card title="Instrument an agent and review traces" href="/ax/learn/getting-started-with-ax/instrumentation" icon="wave-pulse">
  Connect your application to Arize AX and see its traces arrive in real time.
</Card>