Tenor clef to treble clef

1. Is tenor clef the same as treble clef?
2. Why is tenor in treble clef?

Is tenor clef the same as treble clef?

Tenor = treble clef with an 8 below or a double treble clef. Many pieces, particularly those from before the 21st century, use an unaltered treble clef, with the expectation the tenors will still sing an octave lower than notated. Bass = bass clef (fourth-line F clef)

Why is tenor in treble clef?

The vocal tenor clef is used in vocal music for the male tenor voice part to indicate that the tenor voice actually sounds an octave lower that where it is notated in the normal treble clef.