A Guardian is a person that you have nominated in your Last Will. Essentially, they have full custody – or guardianship of your minor children. In other words, they take care of your children that have not yet reached adulthood. Usually this refers to children below 18 years but this might depend on state or national laws.
See also: Guardian – Types, and our Academy posts about what guardians do and how to choose one and why you should appoint one.