Question

what is the "important" of membrane bound organelles inside the cell​

Answer 1

the membranes are permeable by which only selected materials can pass and diffusion process they take materials

Answer 2

An organelle (think of it as a cell's internal organ) is a membrane bound structure found within a cell. Just like cells have membranes to hold everything in, these mini-organs are also bound in a double layer of phospholipids to insulate their little compartments within the larger cells.