diff --git a/content/notes/17-processes-communication.md b/content/notes/17-processes-communication.md
new file mode 100644
index 000000000..a077929af
--- /dev/null
+++ b/content/notes/17-processes-communication.md
@@ -0,0 +1,24 @@
+---
+title: "17-processes-communication"
+aliases: 
+tags: 
+- cosc204
+- lecture
+---
+
+![process tree example](https://i.imgur.com/4ysHisl.png)
+
+# cooperating processes
+defn: coop process -  execution of one process can affect the execution of another. e.e.g, processes for aprallel computing, threads for multithreading.
+
+defn: independent process - one does not affect the other and they do not communicate etc
+
+# creating a child process
+A child process is creating from a parent using fork.
+everything the same as the parent except the child has a differnent process ID.
+
+# communcation between parent and child
+process create a chld process to do a task. but they need to communicate
+
+
+# signal and pipe for inter process communication