Strike

A Strike is a cooperative game mode available in Destiny. A Strike is a structured, progressive, cooperative adventure "ideal for pick-up groups or friends looking for a quick battle together." Strikes are replayable, designed for three-person Fireteams, and usually take 30 to 45 minutes to complete.

Strikes always begin in a public area, so the Fireteam can begin participating in public events, encounter other Fireteams, or explore. When the Fireteam enters the "Strike proper," it becomes private, and the Fireteam will no longer encounter other players. At that point, players go through a structured, crafted mission that culminates in one or more boss battles.

After completing 50 strikes, Badges, Bonds, and Cloaks will be added to the loot table. Strikes played in the Vanguard Playlist do not count toward this goal.

Earth

 * The Devils' Lair

Moon

 * The Summoning Pits

Venus

 * The Nexus
 * Winter's Run

Mars

 * Cerberus Vae III
 * Dust Palace

Vanguard Strikes
Vanguard Strikes, also known as Strike Playlists, allow players to play random Strikes with increased difficulty to earn Vanguard Marks, Vanguard Reputation, and Vanguard gear. There are four playlists:

Weekly Strikes
A Weekly Strike is a strike that is played at a high level and with mission modifiers for rare rewards. Weekly Strikes do not support matchmaking and are changed every Tuesday.

Heroic
The Weekly Heroic Strike is level 22 strike with the Heroic mission modifier and at least one other modifier. Weekly Heroic Strikes are unlocked once a Guardian reaches level 20.

Guardians can select a higher difficulty with better rewards. Each difficulty can award 3 Strange Coins, among other rewards. Completing the Strike once on the highest difficulty will reward the same amount of Strange Coins as when every difficulty is completed in ascending order. To save time, Guardians should simply complete the highest difficulty they can.

Nightfall
The Weekly Nightfall Strike is the same as the Weekly Heroic Strike, but upped to level 28 and with many mission modifiers including Heroic and Nightfall. Legendary and Exotic equipment are rewarded for completing this Strike. Weekly Nightfall Strikes are unlocked once a Guardian reaches level 24.