< p class="Latfirstline">n this article different types of prisons and prisoners who may be confined in them are discussed in the light of prison by-laws. This includes classification and separation of those prisoners who need be detained in different places, such as under 18 years old etc. < p class="Latfirstline"> It is showed that there are few points where prison by-laws need attention in order the meet current provisions whether internal or international. < p class="Latname">