DocumentationMathematicaBuilt-in FunctionsLists and MatricesList Construction
Further Examples: List
A Mathematica list provides a way for you to group any kind of expressions.
Here is a list of numbers.
This gives a list of symbolic expressions.
You can differentiate these expressions.
Or your can find their values when x is replaced with 3.
Here are two ways to see the internal representation of a list.