Microservices is a new architecture of developing software. Microservices is best defined as:
"Service Oriented Architecture composed of loosely coupled components that have clearly defined boundaries"
This can be interpreted a set of software functions that work together based on predefined rules for example take a restaurant website. A typical restaurant website does not have high traffic all through the day, and traffic increases during lunch & dinner time. So having this website on a dedicated VM is a waste of resources. Also the website can be broked down into few distinct functions. The main webpage would be the landing zone, and from there each section like Photos, Menu, Location, etc., could be another independent function. The user triggers these funtions by clicking on the hyperlinks - and users will be served with the requested data.
This implies no coupling or loosely coupled functions that make up the entire website and each funtion can be modified/updated independently. This implies, the business owner can independently - without the need to bringdown the entire website.
From cost prespective also, building a website with Function-as-a-Service - allows the business to pay for the actual usage and each segment of the site can scale independently.
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