For low traffic volumes, lambda is better than an instance because it scales back or goes away altogether when idle, so it's pay per call really, instead of pay

For low traffic volumes, lambda is better than an instance because it scales back or goes away altogether when idle, so it's pay per call really, instead of pay per instance-hour. It's probably a bad idea for high volumes. They also have some nice integrations with other AWS components like S3, dynamo and api gateway, if those float your boat. Eg trigger a lambda function if someone writes a file into S3.