Can any one tell me the difference between while loop or do while loop

Answer 1

while loop executes the code only if the condition is matched and repeats until the condition returns false.
do while executes the loop script every time at least once and after the execution finds out the result of its condition

Answer 2

while loop
Q: what does condition return?
false -> exit the loop
true -> execute the loop script and ask again

do while loop
execute the loop script
Q: what does condition return?
false -> exit the loop
true -> execute the loop script and ask again