A thread is a lightweight process that exists within a program to perform tasks. A single-threaded process only has one thread, while a multi-threaded process contains multiple threads that allow different tasks to be handled simultaneously, improving performance over single-threaded programs by enabling parallel execution. Multithreading is important in Java and allows applications to have reduced computation time by running many tasks at once in a single process.

2.  A thread is a lightweight process which exists within
a program and executed to perform a special task.

3.  A process that has only one thread is referred to as a
single-threaded process.
 A process with multiple threads is referred to as a
multi-threaded process.
 Threading concept is very important in Java through
which we can increase the speed of any application.

4.  In single threaded environment, operations are
executes sequentially, next operation can execute
when the previous one is complete.

5.  A multithreaded program contains two or more
parts that can run.
 Each part can handle different task at the same
time.

6.  Multithreading is allows a program to execute many
tasks at the same time.
 In the multithreading concept, several multiple tasks
are run in a single process or program.

7. when you use MS-WORD you perform a many
different tasks such as printing, spell checking and
so on, at a time.

8.  Reduces the computation time.
 Improves performance of an application.
 Threads share the same address space so it saves
the memory.