Raid or RAID has several meanings:

• Redundant array of independent disks
• Raid bug spray
• The French elite police unit, Recherche Assistance Intervention Dissuasion
• A sudden, forcible entry by police
• A military operation or attack,
  • air raid e.g. Doolittle Raid
  • Commando raid e.g. the Dieppe Raid
  • rescue raid e.g. the Raid at Cabanatuan

• A corporate raid, a type of hostile takeover in business
• A form of auto racing also known as rally
• A project management acronym for Risks Assumptions Issues Dependencies