From 4efd1339f0544673747c9b6fa210aa620e11faed Mon Sep 17 00:00:00 2001
From: Reuben D'Souza <46090211+reubenjds@users.noreply.github.com>
Date: Sat, 31 Aug 2024 04:14:00 -0400
Subject: [PATCH] add horizontal scaling and vertical scaling (#10468)

* add horizontal scaling and vertical scaling

* fix: keep original formatting

* fix: keep original formatting

* fix block
---
 topics/cloud/README.md | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/topics/cloud/README.md b/topics/cloud/README.md
index c56cca6..af139ce 100644
--- a/topics/cloud/README.md
+++ b/topics/cloud/README.md
@@ -91,6 +91,16 @@ AWS definition: "AWS Auto Scaling monitors your applications and automatically a
 Read more about auto scaling [here](https://aws.amazon.com/autoscaling)
 </b></details>
 
+<details>
+<summary>What is the difference between horizontal scaling and vertical scaling?</summary><br><b>
+
+[AWS Docs](https://wa.aws.amazon.com/wellarchitected/2020-07-02T19-33-23/wat.concept.horizontal-scaling.en.html):
+
+A "horizontally scalable" system is one that can increase capacity by adding more computers to the system. This is in contrast to a "vertically scalable" system, which is constrained to running its processes on only one computer; in such systems the only way to increase performance is to add more resources into one computer in the form of faster (or more) CPUs, memory or storage.
+
+Horizontally scalable systems are oftentimes able to outperform vertically scalable systems by enabling parallel execution of workloads and distributing those across many different computers.
+</b></details>
+
 <details>
 <summary>True or False? Auto Scaling is about adding resources (such as instances) and not about removing resource</summary><br><b>
 
@@ -105,4 +115,4 @@ False. Auto scaling adjusts capacity and this can mean removing some resources b
   * Instance should have minimal permissions needed. You don't want an instance-level incident to become an account-level incident
   * Instances should be accessed through load balancers or bastion hosts. In other words, they should be off the internet (in a private subnet behind a NAT). 
   * Using latest OS images with your instances (or at least apply latest patches)
-</b></details>
+  </b></details>
\ No newline at end of file