Tanks
Either shield or armor, Caldari/Minmatar (some)/shield tank.
A good rule of thumb, if the weapons don’t use Capacitor (Missiles/some projectile),
then that ship is going to shield tank, see Raven, Maelstrom, Cyclone/Sleipnir/Claymore, Drake.
Ships that have weapons that use capacitor to fire (hybrid/lasers) will armor tank, see all Gallente/Amarr.

Active Tank: Tank uses capacitor to provide resists and repair.
Mostly this refers to the hardners.

Shield Hardners.

These modules actively use capacitor to harden your tank, granting more of a bonus over their passive counter parts. Includes Shield Boosters and Armor Repairers.

Passive Tank:
Tank does not use capacitor to provide resists or repair. See, Energized Plating (Omni Tank) and Resistance Plating (specific resists) for armor tanks, and Resistance Amplifiers for shields. It’s worth mentioning that shield tanks do not have a comparable [passive] module for omni tanking, only Invulnerability Shield I/II. Passive recharge is a charicteristic specifically regarding shields only. Ever notice how your shield slowly repairs it’s self automatically? Thats the passive recharge. Ships with a high shield recharge rate (Drake) will often passive tank, and supplement their naturally high shield recharge rate with modules that increase it, see Shield Rechargers, Shield Power Relays and Shield Flux Coils.

Tank Size:
Refers to the amount of HP repaired per second, refer back to the Maelstrom and compare with the Typhoon, fitted equally, 1x XL Shield Booster II the Typhoon will, with max skills, boost 120hp/s, where as the Maelstrom thanks to it’s 7.5% Boost Amount/Level bonus, will boost 165hp/s, thus it has a ‘bigger tank’