* Alphabets are writing systems, not inherent to languages. Many languages can be written using different alphabets. For example, English uses the Latin alphabet, but it can also be written in Cyrillic or even a phonetic alphabet.
* Alphabets vary in size. Some alphabets have a large number of letters, like the Khmer alphabet (74 letters), while others are smaller, like the Hawaiian alphabet (12 letters).
* Some languages use syllabaries or abugidas instead of alphabets. These writing systems function differently and have a different number of symbols.
So, the answer depends on what you mean by "alphabet" and which writing system you're considering.
However, if we're talking about alphabets with the most letters, the Khmer alphabet (used for writing Cambodian) is a strong contender with 74 letters.