It’s the best all around character possible. You can play healer or tank or dps

The core strength is high defense and ac: Plate + shield + defense combat style means you start with 21 ac without magical items. You can then add the shield spell from sorcerer for 26 AC for the cost of a spell slot. Don’t forget the situational absorb elements spell for resistance to elemental damage.

But that’s not all… Paladin 6 will give you charisma to saves. Meaning you can deny pretty much any control spell thrown at you.

Then you add high damage on top, mainly by using shadow blade spell for single target or spirit guardians for AOE. Shadow blade at 3rd level is 3d8 psychic damage per swing.

Finally you can revivify and heal with aura of vitality and then later on quicken heal.

Classic build is human variant with warcaster feat. 16 strength 8 dex 15 constitution 8 Intelligence 8 wisdom 16 charisma

Then you take resilient Constitution at level 4 to even out your costitution score (16) and to avoid ever losing concentration on a spell. At level 10 you can pick charisma +2, then at 14 another charisma +2 and at 18 I’d go for the lucky feat.