Serverless Developer Guide
• Resizing images
• Generating dynamic PDFs from customer data
In traditional applications, you write code to do these tasks. You organize that code into functions. 
You put the function code inside an application framework. Whichever framework you picked will 
run inside a language dependent runtime environment. Finally, that runtime environment will be 
hosted on a virtual or physical server.
Setting up, conﬁguring and maintaining the frameworks, runtime environments, and virtual or 
physical infrastructure slows down your delivery of features, bug ﬁxes, and improvements.
What is Lambda?
In Lambda, you write function code. Lambda runs the functions. That’s it. There are no servers.
What is Lambda? 47