Geometric cdf and pdf

What is the difference between these 2 functions and when should I use them? And do these apply to binomcdf and pdf?

CDF is continuous density function and PDF is probability community function.

Think of CDF as cumulative probability as it starts with a C.
Think of PDF as a point probability as it starts with a P

If the problem asks what is the probability that x=y use PDF.
If the problem asks what is the probability that x>y or x<y use CDF.

does this apply to both geometric and binomial?

It applies to all kinds or pdfs and cdfs rather it be normal, geometric, binomial or poisson!

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