# Inventory

Stock (also called inventory) is where you track the materials and parts your business keeps on hand. Whether it's copper pipe in your warehouse, filters on your truck, or shingles at a job site — the stock module keeps count of what you have and where it is.

## Why This Matters

Running out of materials in the middle of a job costs you time and money. Keeping too much inventory ties up cash. The stock module helps you find the balance by showing exactly what you have, where it is, and when you need to reorder.

## Key Concepts

* **Item** — Anything you buy, sell, or use on a job (materials, parts, services)
* **Warehouse** — A location where you store materials (your shop, a truck, a job site)

## The Flow

1. Set up the materials you use → Create [Items](/erpnext-basics/erpnext-basics/stock/items.md)
2. Define where you keep them → Set up [Warehouses](/erpnext-basics/erpnext-basics/stock/warehouses.md)
3. Materials come in from a supplier → Record a Purchase Receipt
4. Materials go out to a job → Record a Stock Entry

***

**In this section:**

* [Items](/erpnext-basics/erpnext-basics/stock/items.md)
* [Warehouses](/erpnext-basics/erpnext-basics/stock/warehouses.md)


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