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+# Amazon Machine Image (AMI)
+
+AMIs are customisations of an EC2 instance.
+
+It's basically a snapshot of an instance that can be used to launch new, customised EC2 instances. This helps with faster boot times. 
+
+So far we have been launching using Amazon's own Linux AMIs. But we can:
+
+- Create our own AMIs
+- Used 3rd party vendor AMIs (can cost)
+
+This allows for the following:
+
+- Create an instance in one AZ
+- Create AMI from that instance
+- Launch a new instance from that AMI in another AZ
+
+