What Is Cloud Computing?
CLOUD COMPUTING is renting COMPUTING (servers, storage, software, networks) over the INTERNET, instead of owning and running your own. The "cloud" provider (Amazon, Google, Microsoft) handles the infrastructure. You just use what you need and pay for it. This is a huge shift from the old days when companies had to buy and maintain their own server rooms.
Why this matters. BEFORE cloud: a startup needed to buy expensive servers, hire IT staff, plan years ahead. NOW: a startup can rent enough computing for a million users in 5 minutes, and pay only for usage. This changed who could build what. Two-person teams can now run global services. Costs are paid as needed. Failure recovery is easier — if a server fails, the cloud provider replaces it.
Which is a KEY benefit of cloud computing?
Service models. IAAS (Infrastructure as a Service): virtual machines, storage — you handle the rest (AWS EC2). PAAS (Platform as a Service): managed platforms; you just deploy code (Heroku, Google App Engine). SAAS (Software as a Service): finished applications you just use (Gmail, Salesforce). Each layer abstracts more away. Most modern companies use a mix.
Cloud Apps
Look at the apps and services you use this week. Which are CLOUD-BASED? (Google Docs, Spotify, Netflix, iCloud — all are.) Which work OFFLINE? Notice how dependent modern life is on cloud services.
Cloud computing is the foundation of the modern internet. Almost every tech company uses it. Understanding it helps you see how the digital world really works.
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