The exact number of stars in the universe is not known, but estimates suggest that there are more stars than grains of sand on Earth. To understand the vastness of the universe, it is helpful to consider the following:
Estimates of the number of stars in the observable universe range from 10^22 to 10^24 (that's 10 followed by 22 to 24 zeros). This number is significantly larger than the estimated number of grains of sand on Earth, which is roughly 7.5 x 10^18 (7.5 followed by 18 zeros).
The number of stars in the universe is so immense that it is difficult to comprehend. Even within our own galaxy, the Milky Way, there are estimated to be around 200 billion to 400 billion stars.
Keep in mind that these numbers are estimates, and our understanding of the universe continues to evolve as scientific discoveries are made. Nonetheless, it is safe to say that the number of stars in the universe far exceeds the number of grains of sand on Earth.