complete protein vs non complete

so i need to be eating protein to build muscle and its like a whole other world of its own. i’ve discovered so many forms of protein(whey concentrate,isolate,plant based, artificial,whole foods etc) and ive been majorly sticking to whole foods bc i feel like its healthier and more nutritious but some days i just really dont feel like i eating 3+ times a day and a protein drink/bar helps fill that gap. so ive tried many protein drinks and my fav has been the core power vanilla. today im looking at the bottle and i see “complete protein”. im trying to better understand what separates this from other protein drinks and bars. is it that the complete protein is basically coming from real animal (dairy) and its not artificial like foods that add in artificial protein like whey? when i look online it just talks abt amino acids and yea thats no simplifying it any better😭