1# Azure Event Grid
2 
3Serverless event routing for event-driven architectures.
4 
5## When to Use
6 
7- Event-driven architectures
8- Reactive programming patterns
9- Decoupled event routing
10- Near real-time event delivery
11- Fan-out to multiple subscribers
12 
13## Required Supporting Resources
14 
15| Resource | Purpose |
16|----------|---------|
17| None required | Event Grid is serverless |
18| Key Vault | Store topic keys |
19 
20## Event Sources
21 
22| Type | Description |
23|------|-------------|
24| System Topics | Azure resource events (Storage, Key Vault, etc.) |
25| Custom Topics | Your application events |
26| Event Domains | Multi-tenant event management |
27 
28## Event Schemas
29 
30| Schema | Use Case |
31|--------|----------|
32| Event Grid Schema | Azure native format |
33| CloudEvents 1.0 | CNCF standard, cross-platform |
34 
35## Environment Variables
36 
37| Variable | Value |
38|----------|-------|
39| `EVENTGRID_TOPIC_ENDPOINT` | Topic endpoint URL |
40| `EVENTGRID_TOPIC_KEY` | Topic access key (Key Vault) |
41 
42## References
43 
44- [Bicep Patterns](bicep.md)
45- [Subscriptions](subscriptions.md)
46