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# Session Management
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Flask provides session handling for maintaining user state across requests using secure cookies by default.
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## Capabilities
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### Session Interface Classes
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```python { .api }
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class SessionInterface:
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    def get_cookie_name(self, app: Flask) -> str: ...
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    def open_session(self, app: Flask, request: Request): ...
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    def save_session(self, app: Flask, session, response: Response) -> None: ...
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class SecureCookieSessionInterface(SessionInterface): ...
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```
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## Usage Examples
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### Basic Session Usage
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```python
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from flask import Flask, session, request
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app = Flask(__name__)
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app.secret_key = 'your-secret-key'
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@app.route('/login', methods=['POST'])
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def login():
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    username = request.form['username']
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    session['user'] = username
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    return 'Logged in'
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@app.route('/profile')
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def profile():
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    if 'user' in session:
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        return f"Hello {session['user']}"
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    return 'Not logged in'
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```