---
title: Concepts
description: Core concepts for building Polkadot Products — identity, accounts and signing, allowances, data placement, and the TestNet networks.
categories: Apps
url: https://docs.polkadot.com/apps/concepts/
word_count: 213
token_estimate: 409
version_hash: sha256:d7f35a94d4a14f0f0557e80ceccd5f577252bdafe83caa9b1da9cc91f5e255b8
last_updated: 2026-10-07T14:52:16+00:00
---

# Concepts

The [Build guides](/apps/build/) and [Deploy Your App](/apps/deploy-your-app/) walk you through tasks. This section explains the ideas underneath them.

<div class="grid cards" markdown>

-   <span class="badge learn">Learn</span> **Identity**

    ---

    The per-app account and Proof of Personhood as a user's two identities, and why your Product's own `.dot` address is not one of them.

    [:octicons-arrow-right-24: Identity](/apps/concepts/identity/)

-   <span class="badge learn">Learn</span> **Accounts and Signing**

    ---

    Which component holds which account — phone, Host, and CLI — and why an allowance can land on the wrong one.

    [:octicons-arrow-right-24: Accounts and Signing](/apps/concepts/accounts/)

-   <span class="badge learn">Learn</span> **Allowances and Permissions**

    ---

    What the grants your Product requests authorize, their scope and lifetime, and how re-approval works.

    [:octicons-arrow-right-24: Allowances and Permissions](/apps/concepts/allowances/)

-   <span class="badge learn">Learn</span> **Where to Store Data**

    ---

    A decision guide across contract storage, cloud storage, the statement store, and local storage.

    [:octicons-arrow-right-24: Where to Store Data](/apps/concepts/data-placement/)

-   <span class="badge learn">Learn</span> **Networks**

    ---

    Paseo Next v2 and Products Devnet: how they relate and the differences that affect your app.

    [:octicons-arrow-right-24: Networks](/apps/concepts/networks/)

</div>