What is the most used email service in the world?

In the vast digital landscape, email services play a pivotal role in daily communication and business transactions. As we delve deeper into the question of "What is the most used email service in the world?" we are met with a plethora of contenders, each boasting its unique features and user base. From the household names that have been around for decades to the up-and-comers with cutting-edge technology, the competition is fierce. But which one truly reigns supreme? Let's explore the market share, user reviews, and global reach of these email services to uncover the true king of email.