The Japan Kendo Federation has an excellent explanation of the history and philosophy of kendo. Very similar to iaido, the concepts and culture of kendo are around self-refinement and cultivation of character over a lifetime of practice.
Kendo is meant to be done in pairs and since there is free, full contact sparring, a flexible bamboo sword and protective armor are needed. Kendo originated from the experiences of the samurai who trained to use “nihonto” (Japanese swords) in combat. The samurai thereby acquired a distinctive appreciation of the “principles of the sword”. It is believed that through learning kendo one is able to gain an understanding of the “principles of the sword”. It is important to study the spirit of the samurai which is related to these principles, and can be learned through rigorous training in the use of the sword. This is why the objective of kendo is referred to as being a Way to develop the human character. -ref All Japan Kendo Federation
Kendo develops the mind and the body through repeating techniques and keiko, and when practiced correctly and with the right attitude the consequence is the building of character and spirit.
In the middle of the Heian period (794–1185), swords with distinctive features such as a curvature (sori) and raised ridges along the length of the blade (shinogi) were produced by Japanese smiths and became an integral part of the samurai’s weaponry. Swords came to symbolize the samurai’s spirit, and are often referred to as embodying the “mind” of the samurai. Not only seen as weapons, sword production flourished as an expression art representing strength and beauty.
From the Warring States period (1467–1603) through to the early stages of the Edo period (1603–1868), many schools of swordsmanship (kenjutsu) were established, and in the 18th century protective training armor resembling that used in kendo today was developed. Through this a new safe, full-contact methodology for kenjutsu training using bamboo swords (shinai) took root. Consequently, a competitive style of kenjutsu competition gained popularity and spread throughout the country around the end of the Edo period. Early in the 20th century, this type of training in swordsmanship, which was referred to as “gekiken” or “kenjutsu” was renamed “kendo” which literally means the “Way of the sword”. Kendo became a representative discipline of modern Japanese “budo” (martial arts/ways), of which the underpinning ideals of self-improvement are grounded in the spirit of the samurai.
The method of kendo that we study and enjoy now is a product of centuries of development in Japan. -ref. All Japan Kendo Federation
There's an excellent article of the History of Kendo on the Japan Kendo Federation page.
Agassiz Dojo Kendo introduces students to the sport and shared etiquette of the sword. Beginners start with shinai training to learn the basics of sword handling, movement, strikes, and etiquette. As a student progresses, they'll put on the armor, and start sparring. Typically it will take a few (3-4) months of shinai and kihon (basics) practice before being able begin sparring.
In addition to the kihon of sword handling, students practice the fundamental kendo bokuto exercises "Bokuto-ni-yoru Kendo Kihon-waza Keiko-ho" which are useful for building techniques and required for rank testing.
There are also 7 paired Tachi-no-kata specifically for kendo where practitioners execute a series of attacks and blocks to specific targets. There are an additional 3 Kodachi-no-kata which utilize the tanto in place of a bokuto.
Similar to iaido, there are some key concepts in kendo which are fundamental and required to score a point in keiko.