A package is a body of Macaulay2 source code devoted to a particular topic. Many packages are distributed with Macaulay 2, and others are available from various users on the internet.
For more detailed information about packages, see
Package.
To load a package, say FirstPackage, use
loadPackage or
needsPackage, as in:
loadPackage "FirstPackage"
or
needsPackage "FirstPackage"
Macaulay2 searches for the file FirstPackage.m2 on your search
path. The packages provided with Macaulay2 are on your search path, as is your current working directory.
Documentation for the packages provided with Macaulay2 is already installed. TO install documentation for another package, use
installPackage.
installPackage FirstPackage
You may see what packages have been loaded with the variable
loadedPackages.
loadedPackages