Abookisasetorcollectionofwritten,printed,illustrated,orblanksheets,madeofpaper,parchment,orothermaterial,usuallyfastenedtogethertohingeatoneside,andwithinprotectivecovers.Asinglesheetwithinabookiscalledaleaf,andeachsideofasheetiscalledapage.Abookproducedinelectronicformatisknownasane-book.
Bookshavealwaysbeenapartofthehumanlifedatingasfarbackas1800BC,astheyslowlyupgradeandimproviseduntilthebookweseetoday.Studentsusenotebookstocopydownvaluableknowledgetaughtintheirschoolseveryday.Scientistsandotherresearchersuselabnotebookstorecordtheirwork.Photograhersputtheirphotosinanalbum,businessesuseaccountingbookssuchasjournalsandledgerstorecordfinancialdatainapracticecalledbookkeeping.Therefore,asyoumayhavenoticed,almosteveryprofessionneedsbooks.Therelationofbooksandhumanscanthenbedeemasunseparable.