Public Cloud: A public cloud is owned and operated by a third-party cloud service provider and made available to the general public. Resources are shared among multiple users. It's typically the most cost-effective option.

Example: Amazon Web Services (AWS) - S3 (Simple Storage Service) is a popular public cloud storage service.

Private Cloud: A private cloud is dedicated to a single organization. It can be hosted on-site or by a third-party provider. Offers greater control and security than a public cloud.

Example: VMware vSphere is a common platform for building private clouds.

Hybrid Cloud: A hybrid cloud combines public and private clouds, allowing data and applications to be shared between them. This provides flexibility and scalability while maintaining control over sensitive data.

Example: A company might use a private cloud for sensitive data and a public cloud for less critical applications. Microsoft Azure offers hybrid cloud solutions.

The primary storage (also known as RAM - Random Access Memory) in a computer system serves as the main memory where the computer actively stores data and instructions that it is currently using. Its primary purpose is to provide fast access to information required for immediate processing.

Key characteristics of primary storage that make it suitable include:

• Speed: RAM allows for very fast reading and writing of data, significantly faster than secondary storage. This is crucial for the computer's performance.
• Volatile: RAM is volatile memory, meaning that data stored in RAM is lost when the power is turned off. This is acceptable as it's designed for temporary storage of actively used data.
• Random Access: Data can be accessed in any order without needing to read through preceding data. This is a significant advantage over sequential access storage.
• Direct Access: The CPU can directly access data in RAM without needing to go through multiple levels of storage devices.

RAM (Random Access Memory) and ROM (Read-Only Memory) are both types of primary storage, but they differ significantly in their characteristics and usage.

RAM:

• Read/Write: RAM allows both reading and writing of data.
• Volatile: Data is lost when power is removed.
• Speed: Very fast access speeds.
• Usage: Used to store the operating system, applications currently in use, and data being actively processed.

ROM:

• Read-Only: Data is typically written to ROM during manufacturing and cannot be easily altered.
• Non-Volatile: Data is retained even when power is removed.
• Speed: Generally slower than RAM.
• Usage: Used to store the BIOS (Basic Input/Output System), which is essential for starting the computer. Also used for firmware in embedded systems.

Comparison Table: