This document defines and describes different types of strikes according to the Industrial Disputes Act, 1947. It begins by defining a strike as a cessation of work by a group of employees in an industry acting together or refusing work under common agreement. It then describes various types of strikes including economic strikes to improve wages/conditions, sympathetic strikes in support of others, general strikes involving many workers, and sit-down, slow-down, hunger, gherao, boycott, and wildcat strikes. It provides examples and explanations of each type. The document also discusses when strikes may be justified or unjustified and outlines penalties for illegal strikes according to the Act.