Based on the learnings from activists associated with the National Alliance of People’s Movements and participants of a social movement at a slum site in Mumbai, the concepts and processes associated with social movement politics are explored. A social movement is a space- and issue-centric collective that gets invoked only when demands are common. Resistance is central to its politics. A social movement is more than just a negotiation with the state; it is also a domain of thinking and implementing alternatives, and opens up the politics of sustainable social change.