The superlative form of the word "happy" is "happiest."
When we use the superlative form, we're describing the highest degree or intensity of something. In this case, we're talking about the most happy or joyful state that one can experience. It's like saying, "out of all the possible levels of happiness that exist, this is the absolute top level."
To form the superlative in English, we generally add "-est" to the end of the adjective (or add the word "most" before the adjective, in some cases). So, "happy" becomes "happiest" when we want to describe the ultimate level of joy.
For example, if you asked a group of friends who had just gone on an amazing vacation which person was the happiest, they might say, "Sarah was definitely the happiest - she was smiling and laughing non-stop the whole time!" In this case, "happiest" is used to describe the person who experienced the most joy and excitement out of the group.
It's worth noting, however, that "happiest" isn't the only way to describe the highest level of happiness. Depending on the context, there might be other more specific or creative ways to convey this feeling - like "overjoyed," "ecstatic," or "on cloud nine." But in general, if you want to emphasize the ultimate degree of happiness, "happiest" is a great word to use.
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