Truancy is the unexcused and illegal absence from compulsory education. It is the opposite of regular attendance, which means being present at all times. Truancy is usually the result of the student's will and decision not to attend without a valid or real excuse, such as a medical condition. School systems and education in general include laws and clear regulations regarding truancy and the necessary procedures for addressing it. Being present at school but not attending classes or lessons is referred to as skipping school lessons.

Punishments
changeUnited States
changeTruancy in the United States is punished by school officials and monitored by parents/guardians. In large school, a fine is imposed ranging from $250 to $500. Around 12,000 students were fined for being truant from school in the city of Los Angeles.[1]
Children are legally required to attend school until they reach a certain age that varies by state (usually 16-18 years old) unless the absence is officially excused from school or the child has been expelled from school.
Children in private schools or homeschooling are exempt from compulsory attendance in public education. [2]