Judo techniques fall into one of three categories: nage-waza (throwing techniques), katame-waza (grappling techniques), and atemi-waza (striking techniques).  The Notre Dame Judo Club offers instruction in nage-waza and katame-waza.  The striking techniques of judo, atemi-waza, are not legal maneuvers in judo competition.  Atemi-waza, are performed primarily in kata, which is the practice of forms.  Click on the underlined headings below to view a list and pictures of all the judo techniques that fall under that category.
 

Nage-Waza (Throwing Techniques)
    Nage-waza can be divided into two sub-categories, tachi-waza (standing techniques) and sutemi-waza (sacrifice techniques).
    The techniques of tachi-waza are performed while standing and fall into one of three categories: te-waza (hand techniques), koshi-waza (hip techniques), and ashi-waza (foot or leg techniques).  The primary part of his body that tori (the thrower) uses to throw uke (the one being thrown) determines what heading a particular tachi-waza technique will fall under.
    The techniques of sutemi-waza involve tori dropping to the mat and using his downward momentum to help throw uke.  There are two types of sutemi-waza: ma-sutemi-waza (back sacrifice techniques) and yoko-sutemi-waza (side sacrifice techniques).  The former involves tori falling to his back to execute the throw.  In the latter, tori falls to his side in order to throw uke.

Katame-Waza (Grappling Techniques)
    The techniques of katame-waza are usually employed when both competitors have fallen to the mat but there are some katame-waza techniques that can be used while standing.  Katame-waza consists of three general types of techniques: osae-komi-waza (hold down or pinning techniques), shime-waza (choke/stangle holds), and kansetsu-waza (joint locking techniques, specifically armbars).

Atemi-Waza (Striking Techniques)
    The striking techniques of judo are never practiced outside of kata as forceful or improper technique could lead to serious injuries or death.  Atemi-waza are classified as either ude-waza (arm strikes) or ashi-ate (leg strikes).

Randori (Free Practice)
    Along with kata (the practice of forms), randori (free practice) is the primary way of practicing and perfecting judo techniques.  In randori two judoka spar with each as they might in an actual match.  They are allowed to execute almost any nage-waza or katame-waza technique they wish so long as they are careful not to injure their training partner.  The use of atemi-waza is randori is prohibited.  Also, a few particularly dangerous nage-waza and kansetsu-waza techniques are not permitted in randori or competition.

Kata (The Practice of Forms)
    Kata (the practice of forms) are pre-determined movements that are used to instruct in the methods of defense and attack.  Kata includes techniques from nage-waza, katame-waza, and atemi-waza.  Atemi-waza can be safely practiced in kata because both tori and uke know what maneuvers will occur and can react appropriately.