Google has confirmed the worldwide service blackout yesterday was caused by a technical fault inside its own systems.
The technology giant saw all its major apps, including YouTube and Gmail, go offline yesterday morning, leaving millions of users unable to access key services.
The company said the outage had occurred within its authentication system, which is used to log people into their accounts, due to an "internal storage quota issue" and apologised to users.
The incident had a far-reaching impact, as other Google services such as Maps, as well as Calendar and its cloud storage Google Drive, were all listed as being affected by the outage on the company's own status dashboard.
Visitors attempting to visit the YouTube website were met with an error message which said: "Something went wrong."
Some of Google's affected services are among the most widely used in the world - YouTube has more than two billion active users, while Gmail is the world's most popular email platform with more than 1.5 billion users.
Service monitoring website Down Detector also reported that users had flagged issues accessing the Google Play Store and the Google Meet and Hangouts communications tools.
In the midst of the outage, many people took to social media to share their frustration with the rare service blackout, with the technology giant fast trending on Twitter.
Responding to the incident, Adam Leon Smith, chairman at the UK Special Interest Group in Software Testing at BCS, the Chartered Institute for IT, highlighted the issues experienced by users of Google's smart home products during the outage.
He said that the incident showed just how dependent on technology the world was today.
"People are sat in the dark unable to turn on their lights controlled by Google Home.
"My last two meetings have been unable to use the planned slides as they are stored in Google Slides," he added.
"Our dependency on technology has grown so much, but the amount spent on reliability, testing and quality hasn't grown in parallel.
"Many companies will be reviewing their SLAs (service level agreements) with Google today and realising their business is dependent on a stack completely outside of their control."