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Computer hardware refers to the physical components of a computer system. These include all the tangible parts that make up a computer, such as:

• Central Processing Unit (CPU)
• Hard Drives
• Memory (RAM and ROM)
• Motherboard
• Input and Output devices like keyboards, mice, and monitors

Each piece of hardware plays a specific role in the functioning of a computer. The CPU is often considered the brain of the computer, responsible for executing instructions and processing data.
Storage devices, like hard drives, store data used and generated by the computer. Memory components help to store and retrieve data quickly, allowing for faster processing speeds. Many devices work together under the direction of the operating system to perform tasks.
In this way, computer hardware provides the foundation for all computing tasks. It is important to note how intricately each piece is interconnected and dependent on the others for efficient operation.

Internal operations in a computer system involve various tasks that the machine performs under the hood. These operations include managing hardware resources, executing processes, and ensuring the system runs smoothly.
Internal operations are coordinated by the operating system. It acts as an interface between the user and the hardware, taking input from the user, processing it, and then sending instructions to the hardware to perform tasks.
The operating system handles multitasking. It allocates system resources, like CPU time and memory, among different applications to ensure efficient functioning. This makes it essential for the smooth running of all processes, from simple computations to complex simulations.

• Task scheduling
• Memory management
• Device control

Moreover, internal operations involve error handling and security features to keep the system stable and secure. This ensures that operations are performed accurately without compromising the computer's safety.

Program control refers to the operating system's capability to manage the execution of software programs. It includes loading programs into the memory, initiating them, and overseeing their execution until completion. An operating system facilitates this by:

• Allocating necessary resources
• Monitoring program performance
• Providing an interface for communication between software and hardware

Program control also involves managing user permissions and access controls to ensure authorized usage of software applications and system resources. The operating system uses features like process isolation and priority levels to determine which programs can run simultaneously and how much CPU is needed for each task.
These controls are vital for system efficiency as they prevent programs from interfering with each other, reduce the risk of system crashes, and enhance user productivity by enabling multiple applications to run at once.