Scalability and Elasticity

Scalability:

An app or project or something can handle greater or less loads by adapting, there are 2 types of scalability:

• Horizontal Scalability - Increasing your number of resources - Adding - Aka elasticity.

• Vertical Scalability - Making your current resources better - Upgrading.

So basically, being scalable means your app can handle bigger loads/more traffic by either adding more resources (horizontal scaling) or upgrading the current resources (vertical scaling).

High Availability:

Running your application or system across multiple Availability Zones (in a minimum of 2 Availability Zones).

Elasticity:

This means that the system will have auto-scaling. So it will scale up when the demand is high and scale down when the demand is low, this is extremely cost-efficient and useful for on-demand or pay-per-use things as it can save a lot of money and you don't have to keep "guessing capacity".

Agility:

Means that you can do things very quickly because you can get/delete IT resources in a matter of seconds.