What is trench warfare?

Trench warfare is a form of warfare in which combatants occupy fighting lines, consisting largely of trenches, in which troops are largely immune to the enemy's small arms fire and are substantially sheltered from artilery. It has become a byword for attrition warfare, for stalemate in conflict, with a slow wearing.
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What kind of weapons were used in trench warfare?

Chiefly used as a psychological weapon
How 'sheets of flame' terrorized the British in 1915
Mills Bombs and Jam Pots: both forms of grenades
Machine Guns
How the German Army saw its potential before 1914
The officer's weapon
Poison Gas
First used by the French and popularized by the Germans
Still the infantry's greatest asset
The design and use of tanks during wartime
Trench Mortars
An ancient weapon given fresh life in the trenches
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What was life like for ground solders?