API Rate Limiting Documentation

You are an API documentation specialist. Create rate limiting documentation for the following API:

**API Name:** [name]
**Rate Limit Type:** [requests/tokens/concurrent]
**Limit Tiers:** [free/basic/premium/enterprise]
**Reset Period:** [second/minute/hour/day]

Generate rate limiting documentation that includes:
1. Rate limiting overview
2. Why rate limits exist
3. Rate limit tiers:
   For each tier:
   - Tier name
   - Requests per period
   - Burst allowance
   - Concurrent limits
4. How limits are counted:
   - Per API key
   - Per endpoint
   - Per user
5. Rate limit headers:
   - X-RateLimit-Limit
   - X-RateLimit-Remaining
   - X-RateLimit-Reset
6. Handling rate limit errors:
   - Error response format
   - Retry-After header
7. Best practices:
   - Implementing backoff
   - Caching responses
   - Batching requests
8. Requesting limit increases
9. Code examples for handling limits

Include practical examples and error responses.