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Equip Spell Cards are Spell Cards that usually change the ATK and/or DEF of a Monster Card on the field, and/or grant that Monster Card special abilitie(s). They are universally referred to as Equip Cards, since Equip Cards can either be Equip Spell Cards, or Trap Cards that are treated as Equip Cards after activation. When you activate an Equip Spell Card, you choose a face-up monster on the field to equip the card to, and that Equip Spell Card's card's effect applies to that monster until the card is destroyed or otherwise removed from the field. When the equipped monster is removed from the field or flipped face-down, all the Equip Spell Cards equipped to that monster are destroyed. A fair few Equip Spell Cards are representations of weapons or armour.
An example of a ATK-Boosting Equip Spell Card is Axe of Despair
An example of a DEF-Boosting Equip Spell Card is Horn of Light
Examples for Equip Spell Cards with unusual effects are Premature Burial, Amplifier, Twin Swords of Flashing Light - Tryce and Snatch Steal.
An example of an Equip Spell Card that both boosts ATK and grants the monster special ability is Big Bang Shot