Difference between horizontal and vertical scaling.

Horizontal Scaling also referred to as "scale-out" is the addition of more machines or setting up a cluster/distributed environment for your software system. This usually requires a load-balancer program which is a middleware component in the standard 3 tier client-server architectural model.

Vertical Scaling also referred to as "scale-up" approach is an attempt to increase the capacity of a single machine by adding more processing power (CPU) or by adding more storage memory (RAM).

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