Sure, but realize also that this is not specific to Julia. The same floating-point standard is followed by essentially all modern languages, and there is lots of learning material online about this (including in Julia).
(Whether big prints all of the digits, i.e. an exact decimal representation, depends on the current precision setting, since BigFloat is variable precision. I don’t remember off the top of my head if there is a function that always prints the exact decimal representation of a floating-point value, regardless of the precision and regardless of how many decimal digits are required?)