"Conjure Elemental" isn't a standard Magic keyword—you may be thinking of "conjure," a mechanic introduced in Alchemy (the digital-only format on MTG Arena). Conjuring creates a brand-new card and puts it somewhere (usually your hand, library, or battlefield). Unlike "create a token," conjured cards are real, fully functional copies of actual Magic cards that exist for the rest of the game.
The key nuance: conjured cards aren't tokens, so they don't vanish when they leave the battlefield, and they can be shuffled, drawn, discarded, and recurred like any normal card. This distinction matters for effects that care about tokens versus nontoken permanents.
Important for Commander players: conjure is an Arena-exclusive mechanic and is not legal in paper EDH. You'll only encounter it in Alchemy or Historic Brawl on Arena, never at a physical table.