e is Euler's number. It is the base of the natural logarithm and has many interesting and mathematically useful properties. For example, the slope of the function ex is ex, meaning that the slope at any point is equal to the y-value of the function.
e is in infinite decimal, the first digits of which are 2.71
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in math, ln means natural log, or loge and e means 2.718281828
A letter in math can stand for any number
Leonhard Euler made many contributions to math but the one thing he is most famous for is changing the base of the natural logarithim by using the letter e which is aka Euler's number
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Leonhard Euler, a aswiss mathematician, started to use the letter e for the constant in 1727. The first book mentioning it is Euler's Mechanica (1736)