For example, while California (population: 39,144,818) has two senators to represent them, Wyoming (population: 586,107) also has two senators to represent them. The population of California is more than 66 times the population of Wyoming, but California and Wyoming still have equal representation in the Senate.
The Senate has a great amount of power when it comes to passing legislation and approving Supreme Court nominees. Though, a Wyomingite's vote counts significantly more than a Californian's vote.