The durability of a sword depends on several factors, including the materials used, the construction techniques employed, and the intended purpose of the sword. Different types of swords have different strengths and weaknesses in terms of durability. Here are a few sword types known for their durability:

1. Katana: The traditional Japanese katana is renowned for its durability. It is typically made using a process called differential hardening, where the edge is hardened to be extremely sharp and resilient, while the spine remains slightly softer to provide flexibility. High-quality katana blades are made from high-carbon steel or a combination of different steel types, resulting in excellent durability and resistance to breaking or chipping.
2. European Longsword: European longswords, also known as hand-and-a-half swords, were prominent during the medieval period. These swords were often well-constructed with a strong and robust design, making them durable for combat. Longswords were made from high-quality steel and were designed to withstand the rigors of battle.
3. Viking Sword: Viking swords, also known as "Ulfberht" swords, were wielded by Viking warriors during the Viking Age. These swords were often constructed with high-quality crucible steel, making them durable and capable of holding a sharp edge. Viking swords had a wide, double-edged blade with a strong central ridge, providing both cutting and thrusting capabilities.
4. Chinese Jian: The Chinese Jian is a straight, double-edged sword with a long history in Chinese martial arts. Jian swords were often crafted with high-quality steel, such as folded steel or Damascus steel, known for their durability and resistance to breaking. They were designed to be flexible yet sturdy, making them suitable for both cutting and thrusting techniques.

While these sword types are known for their durability, it's important to note that the specific durability of a sword can vary depending on the quality of craftsmanship, maintenance, and the individual sword's unique characteristics. Additionally, the way a sword is used and cared for can significantly impact its overall durability. Proper maintenance, regular inspection, and responsible use are key to ensuring the long-term durability of any sword.