Are swords even effective against plated armors in medieval age?

[u/cho929]

Now we have seen plenty of movies depicting that swords can slice through plates armours or any iron/steel armour with ease - is that even possible?

I am particularly skeptical on the power of slashes, I feel like your sword has to be sharp as fuck to able to slice through metal, that and you have to be strong enough to deliver such blow.

Same goes for axes and halberds alike, is the damage comes mostly from the weight of the weapons and the strength of the user - rather than the blades?

Edit: thanks everyone for their answers!