diff --git a/docs/2a/ece250.md b/docs/2a/ece250.md
index cdc0b5a..ee72ecb 100644
--- a/docs/2a/ece250.md
+++ b/docs/2a/ece250.md
@@ -149,3 +149,12 @@ fn sort(A: Vec) {
 	}
 }
 ```
+
+## Graphs
+
+!!! definition
+    - A **vertex** is a node.
+    - The **degree** of a node is the number of edges connected to it.
+    - A **connected graph** is such that there exists a path from any node in the graph to any other node.
+    - A **connected component** is a subgraph such that there exists a path from any node in the subgraph to any other node in the subgraph.
+    - A **tree** is a connected graph without cycles.