If you used the internet at all on Monday, you probably noticed a lot of things weren’t working all that well. Sites and services around the world experienced interruptions, including the likes of Facebook, McDonald’s, and even Fortnite. You might have heard by now that the issues were caused by an AWS outage . If you don’t know what AWS is, however, that explanation might not be all that clear.
“Amazon Web Services” runs the internet
AWS is an Amazon subsidiary, short for Amazon Web Services. The company offers over 200 cloud-based products to customers , including applications for all of the following:
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Accessing AWS services
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Analytics
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Application integration
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Blockchain
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Business applications
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Cloud Financial Management
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Compute
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Customer enablement
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Containers
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Databases
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Developer tools
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End user computing
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Frontend web and mobile services
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Game tech
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IoT
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Machine learning and AI
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Management and governance
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Media
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Migration and transfer
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Networking and content delivery
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Quantum technologies
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Satellite
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Security, identity, and compliance
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Storage
More than this list, it’s important to understand why AWS matters. The service replaces the need for companies to purchase their own hardware for their data storage, networking, and computing requirements. Instead, companies can choose to outsource these needs to AWS, and adjust those services as those needs change. As such, a company can start out hiring AWS to handle a small amount of their processing, but as the company grows, they can choose to add more servers to their plan—rather than invest in additional hardware to handle the processing. This is known as cloud computing.
In order to keep up with a global demand, AWS relies on a large number of physical server locations spread out throughout the world. Amazon says AWS has 120 “Availability Zones” across 38 global regions —physical locations that contain at least one data center with “redundant power, networking, and connectivity.” The idea is, having these physical data centers across continents means your cloud compute is easier to expand and is better protected from failure—which is a little ironic, given today’s events.
How much of the internet runs on AWS?
In theory, there are a lot of advantages to cloud computing. It can be much simpler and cost efficient for a company to rent AWS servers and technology to power their applications, store their data, or handle their traffic. As such, a lot of the world runs on AWS. According to HG Insights , as of 2025, 4.19 million businesses with a physical address use AWS. (There doesn’t appear to be data on customers without a physical address, so this number could be much higher.) In addition, AWS is the largest cloud computing company in the market at this time: That same report found AWS has 30% of the market, while competitors like Microsoft Azure and Google Cloud make up 20% and 12%, respectively.
Why an AWS outage is such a big deal
When so many companies rely on your cloud computing to run their internet-based services, the risk for failure is great. That’s what we saw on Monday: AWS’ outages resulted in issues with many sites and services. If the HG Insights is correct, as many as 30% of businesses that use some type of cloud computing services could have been impacted today. One analyst thinks the impacts of the outage may be billions of dollars in lost revenue. It’s not clear what the solution is, but it’s clear that there’s a jeopardy in so much of the internet relying on one cloud hosting service.
