Thread is an independent flow of execution with in a 
process. A process can have any number of threads.

Thread is a block of code which is executed concurrently 
independent of other threads with in a process.

single process running at a time or current process is 
thread.

Interrupts are necessary for handling time-critical 

tasks, but there’s a large class of problems in 

which you’re simply trying to partition the problem 

into separately-running pieces so that the whole 

program can be more responsive. Within a program, 

these separately-running pieces are called threads 

and the general concept is called multithreading. A 

common example of multithreading is the user 

interface. By using threads, a user can press a 

button and get a quick response rather than being 

forced to wait until the program finishes its 

current task.

Ordinarily, threads are just a way to allocate the 

time of a single processor.

Thread is a sequential flow execution, that it has one 
entry point,one exit point, some sequence of steps in 
betwwen start nd stop. Other wise u can say like this : 
Thread is alight weight process, y because its havening 
less over heads

Itz a small unit of execution or a light weight process.