Initial value expression Vs value expression

[tanvirtonu1]

I found that in terms of variable if I set the following-

[ Initial value expression ="Some data"  , Reset Type=Report  ]  , I get the value in Report

and if I set the following-

[  Value expression ="Some data"   ,   Reset Type=None   ]  I also get the value in Report

Why is it so, what is reset type and how is it related to Initial value expression and valueexpression

And what is the actual difference between "Initial value expression" and "value expression"?

PLS somebody help me, I m new.