# What Is a DAG?

Learn about DAGs and how they relate to the ML pipeline.

## We'll cover the following

## Introduction to DAGs

In graph theory, a **directed acyclic graph (DAG)** is a set of vertices or nodes connected by edges so that:

Every edge is unidirectional.

There are no loops in the graph if we follow the edge directions.

This will become clear after we see a few examples.

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