KINDLY explain to me what selectively permeable means in simple words like really simple cause am revising cell stuff

Well ,Selectively permeable means a membrane allows the passage of some molecules or ions and inhibits the passage of others. The capacity to filter molecular transport in this manner is called selective permeability. or a property of cellular membranes that only allows certain molecules to enter or exit the cell. ... Movement across a selectively permeable membrane can occur actively or passively. ( best example would be ) For example, water molecules can move passively through small pores on the membrane.

Explanation:

hopefully that made sense they're really isn't a shortcut on explaining this type of topic but i tried to make it as understanding as possible, Good luck! :)  

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.