Tank

Tanks are heavily armed and armored full tracked vehicles intended for front-line combat. There are other tracked units (such as the Flak track, Bullfrog or Specter) but these are not regarded as tanks because they are either half tracks or not intended for front-line combat.

There are exceptions: there are tanks designed for a supporting role and/or ones without full tracks but are regarded (or explicitly labelled in-game) as tanks nonetheless. E.g. The robot tank has no tracks but is regarded as one because it fills a similar role. The Spider tank is explicitly called a tank in-game.

Generally, they are heavily-armed and heavily armoured compared to other vehicles but slower and designed for front-line combat rather than support. Contrast with Mechanized walkers.

Light tanks
Light tanks are designed for rapid movement and outmanoeuvring heavier vehicles. Light tanks can be used for reconnaissance or infantry support.

Tiberian Dawn

 * Light tank (Tiberian Dawn)

Red Alert

 * Light tank (Red Alert 1)

Red Alert 2

 * Light tank (Red Alert 2)
 * Lasher tank

Renegade

 * Light tank (Renegade)

Medium tanks
Medium tanks represent the compromise between the mobility oriented light tanks and the armour and armament oriented heavy tanks. Most medium tanks lines eventually evolved to become what are called main battle tanks in most countries.

Tiberian Dawn

 * Medium tank (Tiberian Dawn)

Red Alert

 * Medium tank (Red Alert 1)

Renegade

 * Medium tank (Renegade)

Generals 2

 * Medium rocket tank

Heavy tanks
Heavy tanks are a class of tanks that generally provided better armour protection and greater firepower at the expense of speed and manoeuvrability.

Red Alert

 * Heavy tank (Red Alert 1)

Tiberian Sun

 * Heavy tank (Tiberian Sun)

Red Alert 2

 * Rhino tank (Red Alert 2)

Red Alert iOS

 * Heavy tank (Red Alert iPhone)

Trivia

 * None of the tanks in Command & Conquer have a machine gun, probably for balancing purposes.