A header and footer will appear on every slide.
Header and footer include information about
slide number,
date,
name of the presenter.
The masters store header and footer information.
Header and footer also appears on handouts and note pages.
Tip: to turn off header and footer on the title slide,
Click the View menu,
click Header And Footer,
click the Slide tab,
select the Don't Show On Title Slide check box,
click Apply To All.