Auto-scaling is a way to automatically scale up or down the number of compute resources that are being allocated to your application based on its needs at any given time. Before cloud computing, it was very difficult to scale a website, let alone figure out a way to automatically scale (autoscale) a server setup.
A load balancer is a device that acts as a reverse proxy and distributes network or application traffic across a number of servers. Load balancers are used to increase capacity (concurrent users) and reliability of applications.
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