MetaMask 🦊🔐

1. What is MetaMask?

MetaMask is a crypto wallet and browser extension that allows users to interact with blockchain applications.

2. What Does It Do?

Store crypto 💰
Send/receive transactions 🔁
Connect to DApps 🌐
Sign smart contract actions ✍️

3. How MetaMask Works

User → MetaMask 🦊 → Smart Contract 📜 → Blockchain ⛓️ → Result

4. Key Features

Ethereum wallet 🪙
DApp browser 🌐
Transaction signing ✍️
Network switching 🔄

5. Wallet Concepts

Public Key → Wallet Address (shareable)
Private Key → Secret access (never share)
Seed Phrase → Backup recovery words

6. DApp Connection Flow

Click "Connect Wallet"
→ MetaMask popup opens
→ User approves connection
→ DApp gets wallet address

7. Networks in MetaMask

Ethereum Mainnet ⛓️
Sepolia Testnet 🧪
Polygon 🔷
BNB Chain 🟡

8. Security Rules

Never share seed phrase ❌
Never share private key ❌
Always verify DApp URLs 🔍