Discarding a card from your Hand can either be as a result of a card effect, or as a requirement to activate a card. Two such examples are Spirit Reaper and Lightning Vortex. When a card is discarded it is not considered destroyed.
A card being discarded does not necessarily go to the graveyard. Although this is normally the case, cards like Macro Cosmos will send the cards to the Removed from Play Zone instead; however, the card is still considered as being discarded regardless.
Types of Monster Cards
Types of Spell Cards
Types of Trap Cards
ATK • DEF • Level • Attribute • Type
Playing Field Zones
Types of Summon
Types of Monster Effects
Types of Effect Monsters
Types of Spell Speed
Aqua • Beast • Beast-Warrior • Dinosaur