What is auto scaler in AWS?Which one is more preferable horizontal or vertical?

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Auto scaler in AWS automatically adjusts the number of EC2 instances in a group based on traffic or performance metrics.

Auto scaler helps in maintaining optimal performance and cost efficiency by scaling EC2 instances up or down as needed.
Horizontal scaling adds more instances to the existing pool, while vertical scaling increases the size of existing instances.
Horizontal scaling is generally more preferable as it provides better fault tolerance and scalability compared to vertical scaling.
Examples of auto scaler in AWS include AWS Auto Scaling and Elastic Load Balancing.

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What is auto scaler in AWS?Which one is more preferable horizontal or vertical?

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