The basic gameplay loop of clicker games is easy to understand. Players usually click or tap an object to generate coins, points, or another resource. Those resources can then be spent on upgrades that increase the value of each click or generate income automatically. As production improves, players can afford more powerful upgrades and reach new milestones faster.
This progression is what makes the genre enjoyable. A single click may seem insignificant at first, but repeated improvements can eventually create a much faster resource-generating system.