Tactics is what you do when there's something to do, strategy is what you do when there's nothing to do.
Someone, (Tartakower?) said that.
Strategy is your long term plan, about controlling key squares, changing bad pieces for good, gaining tempi or space, etc.
Tactics are a short-term forced continuation usually leading to gaining material or mate.

can someone please tell me in chess the difference between strategy and tatics seems to me that they are somewhat the same