[2019] What is the concept "tanking" in battleships?

The Battleship is a massive threat. Historically and in-game, they are seen as massive damage dealers with the ability to carry a match from most ranges depending on meta for each specific country and class.

They are also seen as giant, often slow, HP pinatas, for an aggressive cruiser, destroyer, and battleships to reap and smash.

Tanking or "Damage Sponging" is a great tactic and so far the suggestions in this thread have been educational and well said.

The key comes down to managing the damage you are taking vs the amount of HP and heals you have. Being able to be the "Fire Magnet" to better provide your team with the advantage.

So my question would be what ship do you find pulls this tactic off the best? As one who is not the best at BB's I have found the Nelsons "Super Heal" useful in pulling this off on occasion.