Japanese Language Proficiency Test.
This is an exam designed for non-native speakers of Japanese to measure their abilities. The exam consists of five levels; N5 is the lowest and N1 is the highest. In general, each level has sections for vocabulary, grammar, reading comprehension, and listening comprehension, though the distribution of questions and duration of each section vary.
Certification for Levels N2 and N1 are considered advantageous when applying for jobs that require Japanese language ability.
In Japan, it is offered twice per year, in July and in December.