Can you explain the difference between vertical and horizontal scaling in system architecture?

During my final year at university, I worked on a group project to develop a web application for managing college events. Initially, we used vertical scaling by running our application on a single server with limited resources. When we began to see increased traffic, we realized this approach was not sustainable. We researched and decided to implement horizontal scaling by deploying our application across multiple servers using a load balancer. This experience taught me the importance of scaling in architecture and how horizontal scaling improved our application's performance and reliability during peak usage.

In my volunteer role at a local charity, we organized an annual fundraising event. Last year, we faced the challenge of managing a large number of attendees. We initially planned to handle everything with one main event coordinator, which was a form of vertical scaling. However, as the event grew, we realized that this was inefficient. We decided to create a team of coordinators, each responsible for different aspects of the event, which is akin to horizontal scaling. This distributed approach allowed us to manage tasks more effectively and ultimately led to a more successful event, raising 30% more funds than the previous year.

In my first job as a junior developer at a startup, we were tasked with improving an existing product that was struggling to handle user growth. Initially, the product used vertical scaling, which led to performance issues during high user traffic. I collaborated with the team to transition to a horizontally scaled architecture by integrating microservices. This change allowed us to distribute workloads across multiple servers, which not only improved performance but also provided better fault tolerance. I learned how effective scaling strategies can significantly impact a product's success, especially in a competitive market.