Need Help to Explain this Formula

I am going to be a college student in next year. Recently, I found that there is something with my computer circuit. This caused my interesting that I would like to calculate the working principle in this circuit.There is a parallel plate capacitor and batteries and lots of wires .According to some data and examples from websites ,l get this C=kϵ0Ad. But I still not totally understand this formula . What is the parameter stand for? Is there anybody can share ideas?

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C is capacitance
k is the dielectric constant of the material
ε0 = 8.854x10-12F/m (farads/meter) = vacuum permitivity aka the permitivity of free space
A is the overlapping surface area of the plates in m2
d is the distance between the plates in m

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