---
title: "Concepts"
description: "Core concepts for building Polkadot Products — identity, accounts and signing, allowances, data placement, and the TestNet networks."
categories: "Apps"
url: "https://developers.polkadot.com/apps/concepts/"
word_count: 162
token_estimate: 298
version_hash: "sha256:c47d775c544d4066166c026e473bbeaae2960d67e87ae6f70564117798a124e8"
last_updated: "2026-11-13T11:04:04+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">

-   **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.

    [→ Identity](/apps/concepts/identity/)

-   **Accounts and Signing**

    ---

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

    [→ Accounts and Signing](/apps/concepts/accounts/)

-   **Allowances and Permissions**

    ---

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

    [→ Allowances and Permissions](/apps/concepts/allowances/)

-   **Where to Store Data**

    ---

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

    [→ Where to Store Data](/apps/concepts/data-placement/)

-   **Networks**

    ---

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

    [→ Networks](/apps/concepts/networks/)

</div>