Here is an official explanation:
About the Official Gazette:
The Official Gazette is published in there Series, namely Series I, Series II, Series III. In addition, Extraordinary and Supplementary Gazettes are brought out as and when requested for by the Department concerned depending upon the urgency and the public interest.
The contents of each of the Series are as given below:
a) Series I which is the principal part of the Gazette, being of Legislative nature, contains Stationary Acts and Rules, Regulations, Bye-Laws, Notifications and Orders issued in pursuance thereto. In addition, the recruitment rules which are framed under Article 309 of the Constitution of India to determine the mode of recruitment to posts in Group ‘A’. ‘B’, ‘C’ and ‘D’ categories in various Departments of the Government from time to time, are also notified. Continue reading

