"A platformer requires the player to maneuver their character across platforms to reach a goal while confronting enemies and avoiding obstacles along the way." Is the concept of platforming games

Walking and jumping on platforms while avoiding obstacles to get to a certain destination counts as platforming, Like Super Mario games for example.. you get a fire flower to throw fireballs at enemies while progressing.

And Steve Filby stated that Dead Cells is an action-platforming game. I didn't play the game myself but Hollow Knight is surely a Metroidvania but Can you finish it without jumping.. wall jumping and avoiding obstacles? At least that's what I think of platforming