Jumba's computer is a machine that Jumba constructed (or upgraded) to show pictures of the experiments and information on their number and primary function. It can also reveal an antidote for any experiment's power or effect on a person. The experiment's info can also be shown on Lilo's computer and told on Gantu's experiment analyzer.
Jumba's computer displays crude 2-D representations of the experiments, along with specific information on them and occasionally antidotes for the experiments' effects. Jumba also keeps self-made video diaries which explain his thoughts or the results of his illegal experiments (as displayed in "Frenchfry").
Jumba's computer even consists some of the experiments' powers. In "Angel" after Lilo discovered that Jumba had been reverted to evil by Angel (624), she used the computer to play Angel's song backwards and successfully turns him back to good.