A booklet is a small book.
https://www.google.com/search?q=how+to+fold+a+sheet+of+paper+into+a+booklet&rlz=1C1CHBF_enUS702US702&tbm=isch&source=iu&ictx=1&fir=-rTaZ-4wvTRy1M%253A%252CIXpjzW2EQMtu-M%252C_&vet=1&usg=AI4_-kSmDG3BrcLcYBks-j1veNtJih7wbw&sa=X&ved=2ahUKEwiFoZyinbTiAhVEMawKHdE5BCwQ9QEwAHoECA0QBg#imgrc=-rTaZ-4wvTRy1M:
https://www.pinterest.com/pin/444519425704694121/
https://www.pinterest.com/pin/361273201329346577/
https://www.pinterest.com/pin/203647214372145643/