I am new to statistics.

The doc of density() function says `The algorithm used in density.default disperses the mass of the empirical distribution function over a regular grid of at least 512 points ...`

what does the word "empirical" mean? what is the definition of "empirical distribution" ?

Is there a theoretical distribution?

what is the relationship of "empirical distribution" and "theoretical distribution"?

I googled a lot and didn't get answers with elaborate examples or authoritative reference(say a college textbook)

thank in advance.

It's the distribution of the observed data

Two resources I use when encountering mysterious math terms: Wikipedia and Wolfram MathWorld. Wikipedia may surprise you with how detailed but useful the content is. Expect to go deep into the "related article"-holes before you fully understand something.

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