4. Differences between process and thread 5. Diff b/w struct and union

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Accepted Answer

Process is a program in execution, while thread is a subset of a process that can run concurrently with other threads.

A process has its own memory space, while threads share memory with other threads in the same process.
Processes are independent of each other, while threads are not.
Processes communicate with each other through inter-process communication mechanisms, while threads communicate through shared memory.
Struct is a user-defined data type that groups related data items of different data types, while union is a user-defined data type that allows storing different data types in the same memory location.
Structs are used to represent a collection of related data, while unions are used to save memory space.
Structs allocate memory for each member variable, while unions allocate memory for the largest member variable.

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