Similarities between Process and Threads

Both have a parent process.
Process has a process id same way thread has a thread id.
We can create a process within a process same way we can create thread within a thread 
Both process and thread has priorities.
Unlike processes, threads are not independent of one another.
Unlike processes, all threads can access every address in the task .
Unlike processes, thread are design to assist one other. Note that processes might or might not assist one another because processes may originate from different users.
Thread is a light weight process that is the only comparision. Otherwise you cannot compare both.


A thread is contained inside a process. Multiple threads can exist within the same process and share resources such as memory, while different processes do not share these resources.
A Process is an instance of a computer program, consisting of one or more threads.
Each process must have at least one thread running within it, and each thread must be running within a process.
Each process gets it own address space and memory allocation by OS, where as thread makes use of its parent process resources.
When parent process dies, all its child process dies, but v-v is not true