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definition of thread?

 
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Could anyone tell me what this statement is really saying about thread?


"A thread is an independent sequential path of execution within a program."


Thanks

 
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One way to look at it is that normally your code has a linear flow to it- one line executes, and then the next line executes. It always goes in order. It may branch, but the branches are determined deterministically by comparisons.

Now when you add a thread, there are two independent threads of execution which interact. A single line of code can execute, then the thread can switch, and this same line of code can execute again!
 
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