Why capacitor blocks DC

I somewhere read on the internet that DC is a constant straight line and blocked by the capacitor plate, but AC is sinusoidal and passes through the capacitor plates as you can see in the image, sounds funny, so what is the reason behind this unknown behavior?

In practice, neither AC nor DC are supposed to pass through the capacitor. AC is an alternative quantity, suppose we supply an AC to the capacitor. capacitor one plates charges to positive and one to negative. after some time the direction of current changes, also the polarity on plates changes. due to this, we think thinks that current is passed through a capacitor, but in reality only the direction of current changes.

Why capacitor hates DC??

When DC is put across the capacitor, it starts charging and the voltage of capacitor plates also starts increasing. A saturation comes when the voltage across the capacitor becomes equal to the supply voltage. As we all know the flow of current requires a voltage difference so the capacitor starts blocking DC.