A wildcat strike refers to a strike that is undertaken without the approval or involvement of a trade union or other formal organization. It's a form of industrial action that is undertaken spontaneously by workers, often as a response to poor working conditions or other grievances. Some key characteristics of wildcat strikes include:

• They're typically unplanned and unannounced.
• They can spread quickly and unpredictably.
• They're often difficult to control or manage.
• They can be highly disruptive to businesses and cause economic losses.
• They can be a sign of deep dissatisfaction among workers.

Wildcat strikes can be seen as a way for workers to assert their power and demand better working conditions, but they can also lead to negative consequences such as job losses, legal action, and public backlash.