Men: most adult men are baritones, so a baritone result is the most likely outcome, and true basses who can sustain an E2 are rare. If you flip into falsetto at the top, those notes still count toward your range, but they don't make you a tenor on their own. Tenors keep a full, connected sound up around G4 to A4.
Women: mezzo-soprano is the most common female voice type. Many women who mostly sing pop use chest voice and test lower than they would after some training, because head voice adds the top of the range. If your result says alto but you can float easily above C5 in head voice, take the test again and use that lighter sound for your highest notes.
Teens: voices change a lot during puberty. Boys' voices drop about an octave over a year or two, and girls' voices drop a few semitones. A result taken mid-change describes your voice today, not your adult voice type, so retest every few months, keep it comfortable, and stop if anything hurts or feels scratchy.
Adult voices keep changing slowly, too. Classical teachers often wait until a singer is in their twenties before settling on a voice type, and hormonal changes such as menopause can lower a voice later in life.