I am in the process of designing my app from the ground up in lightning. Basically it would contain some html and css that displays data based on post or get api calls from its controllers to an external website. (my website that has the web app version)
I want to understand the difference between creating a connected app vs creating a lightning app? ( I want to create lightning components that have the lightning design system styling, so I can add it easily to lightning layouts). How will in each my back-end code connect to these salesforce lightning components?
I know if canvas app, and canvas app is definitely a way to do this. But how to do this without using canvas app ( and having all of our styling and everything in lightning itself )