Step 1: Understand what pressure groups and movements are trying to do.
They do not contest elections themselves, so instead they push their demands onto the people who do hold power, through public pressure and persuasion.
Step 2: They shape what people think.
Campaigns, rallies and media coverage build public awareness around an issue, and once enough citizens back a cause, elected leaders feel pressure to respond to it.
Step 3: They work directly with those in power.
By meeting officials, submitting petitions and lobbying political parties during elections, they try to get their concerns written into policy or law.
Step 4: They fall back on protest when needed.
Strikes, dharnas and demonstrations are used when quieter methods do not work, keeping the issue visible until the government acts.
Hence, pressure groups and movements influence politics mainly by shaping public opinion, engaging policymakers directly, and organising protest when necessary.