This application is a mobile version of the website http://www.paraparalovers.com, which is a parapara video, techpara video, and Eurobeat / Hyper Techno CD reference website.
ParaPara is a dance that heavily relies on hand movements and is most popular in Japan. It first originated in the late 80s and is still danced today. It could be compared to "break-dancing" these days.
ParaPara is mostly danced to Eurobeat music, while TechPara is danced to "Hyper Techno" music. They are both danced to electronic dance music.
This application is important because there are a few thousand major ParaPara videos and TechPara videos, so it is important to organize the videos and make them easily searchable.
The content in all of the databases are works in progress so data could be added or corrected at any time. "ParaPara Database" is the most complete at the time of writing however.