What Is the Cloud

Before you protect something, you need to understand what it is. The cloud is a network of servers hosted on the internet that stores data, runs software, and processes information — instead of doing all of that on your own computer or office server.

Think of It Like a Power Grid

Your home does not generate its own electricity. You plug into a shared power grid, use what you need, and pay for it. The cloud works the same way. Companies plug into a shared network of computing power, use what they need, and pay for it. They do not build or maintain the physical machines themselves.

What Lives in the Cloud

When you use Gmail, watch Netflix, or store photos on Google Drive, you use the cloud. Your data sits on servers owned by Google, Netflix, or Amazon — not on your device. Businesses use the cloud to host websites, run applications, store customer records, and process payments.

Three Types of Cloud Environments

Public Cloud

A public cloud is owned and operated by a third-party provider like Amazon Web Services (AWS), Microsoft Azure, or Google Cloud. Many customers share the same physical infrastructure. Think of it like renting a desk in a co-working space — the building is shared, but your desk is yours.

Private Cloud

A private cloud is dedicated to one organization. Only that company uses the infrastructure. Think of it like owning your own office building. It gives more control but costs more to run.

Hybrid Cloud

A hybrid cloud mixes both. A company might keep sensitive financial records on a private cloud but run its public website on a public cloud. Think of it like owning a private office for confidential meetings while also renting a desk in a co-working space for general work.

Why Does the Cloud Need Security

Because your data moves over the internet and sits on servers you do not physically own, new risks appear. Anyone with internet access could potentially try to reach your data. Misconfigurations, weak passwords, and unpatched software create openings that attackers look for. Cloud security is the set of tools, policies, and practices that protect that data and those systems.

A Simple Diagram: Your Data's Journey to the Cloud

[ Your Device ]
      |
      | (Internet)
      |
[ Cloud Provider's Data Center ]
      |
      |--- Your App (e.g., website)
      |--- Your Database (e.g., customer info)
      |--- Your Storage (e.g., uploaded files)

Every arrow in that diagram is a point where security matters. Data can be intercepted in transit, stolen at rest, or accessed by unauthorized users if security controls are missing.

Key Terms to Know

• Server: A computer that stores and serves data to other computers.
• Data Center: A physical building full of servers that a cloud provider owns.
• Cloud Tenant: A customer who rents space on a shared cloud infrastructure.
• Workload: Any application, process, or task running in the cloud.

What You Learned

The cloud is shared internet-based infrastructure you rent instead of own. It comes in public, private, and hybrid forms. Because your data travels over the internet and lives on shared servers, it faces risks that demand dedicated security practices. The rest of this course shows you exactly how to handle those risks.