No, pi cannot be expressed as a fraction. Pi (π) is an irrational number, which means it cannot be written as a simple fraction that represents the ratio of two integers.
To elaborate, irrational numbers are those that have non-repeating, non-terminating decimal expansions. The value of pi is approximately 3.14159, but its decimal representation goes on infinitely without repeating. This characteristic is what disqualifies pi from being expressed exactly as a fraction.
While many people use approximations of pi, such as 22/7 or 3.14, these are not exact. They may be used for calculations and can provide a close estimate, but they do not capture the true value of pi.