Cat (Felis catus), also known as the domestic cat or house cat to distinguish it from other felines, is a small predatory carnivorous species of crepuscular mammal that is valued by humans for its companionship and its ability to hunt vermin, snakes and scorpions. It has been associated with humans for at least 9,500 years.

Category 5 cable, commonly known as Cat 5, is a twisted pair (4 pairs) cable type designed for high signal integrity. Many such cables are unshielded but some are shielded. Category 5 has been superseded by the Category 5e specification. This type of cable is often used in structured cabling for computer networks such as Ethernet, and is also used to carry many other signals such as basic voice services, token ring, and ATM (at up to 155 Mbit/s, over short distances).

Cathédrale Notre-Dame de Bayeux is a Norman-Romanesque cathedral, located in the town of Bayeux. It is the seat of the Bishop of Bayeux. It was the original home of the Bayeux Tapestry and is a national monument of France.

Cathédrale Notre-Dame de Paris is a Gothic cathedral on the eastern half of the Île de la Cité in Paris, France, with its main entrance to the west. It is the cathedral of Paris and the seat of the Archbishop of Paris. Notre Dame de Paris is widely considered one of the finest examples of French Gothic architecture. It was restored and saved from destruction by Viollet-le-Duc, one of France's most famous architects. The name Notre Dame means "Our Lady" in French. Notre Dame de Paris was one of the first Gothic cathedrals, and its construction spanned the Gothic period. Its sculptures and stained glass show the heavy influence of naturalism, unlike that of earlier Romanesque architecture.

Cato Street Conspiracy was an attempt to murder all the British cabinet ministers and Prime Minister Lord Liverpool in 1820. The name comes from the meeting place near Edgware Road in London.

Cato the Elder Marcus Porcius Cato (Latin: M·PORCIVS·M·F·CATO (234 BC, Tusculum-149 BC) was a Roman statesman, surnamed the Censor (Censorius), Sapiens, Priscus, or the Elder (Major), to distinguish him from Cato the Younger (his great-grandson). Cato the Elder came of an ancient Plebeian family who all were noted for some military service but not for the discharge of the higher civil offices. He was bred, after the manner of his Latin forefathers, to agriculture, to which he devoted himself when not engaged in military service. But, having attracted the notice of Lucius Valerius Flaccus, he was brought to Rome, and successively held the offices of Cursus Honorum: Tribune (214 BC), Quaestor (204 BC), Aedile (199 BC), Praetor (198 BC), Consul (195 BC) together with his old patron, and finally Censor (184 BC).

Cato the Younger Marcus Porcius Cato Uticensis (95 BC-46 BC), known as Cato the Younger (Cato Minor) to distinguish him from his great-grandfather (Cato the Elder), was a politician and statesman in the late Roman Republic, and a follower of the Stoic philosophy. He is remembered for his legendary stubbornness and tenacity (especially in his lengthy conflict with Gaius Julius Caesar), as well as his immunity to bribes, his moral integrity, and his famous distaste for the ubiquitous corruption of the period.

Cattle, colloquially referred to as cows, are domesticated ungulates, a member of the subfamily Bovinae of the family Bovidae. They are raised as livestock for meat (called beef and veal), dairy products (milk), leather and as draft animals (pulling carts, plows and the like). In some countries, such as India, they are honored in religious ceremonies and revered. It is estimated that there are 1.3 billion cattle in the world today.

Cauca River, river in Colombia that lies between the Occidental and Central cordilleras. Born in southwestern Colombia near the city of Popayán, it joins the Magdalena River just south of Santa Cruz de Mompox. It has a total length of 1350 km. from origin to mouth. The river is under the supervision of the Corporación Regional del Cauca and the Corporación Autonoma Regional del Valle del Cauca.

Caucasus The Caucasus or Caucas (also referred to as Caucasia, is a geopolitical region located between Europe, Asia, and the Middle East. It is home to Europe's highest mountain (Mount Elbrus).