twice what is love?

It looks like you're asking about the meaning of "love" and perhaps how "Twice" relates to that. If you're asking what is love in a general sense:
Love is a deep feeling of affection, care, and attachment toward someone or something. It can take many forms, such as romantic love, familial love, friendship, or self-love. Love often involves compassion, trust, respect, and emotional connection. If you’re referring to "What is Love?" in relation to TWICE , the K-pop girl group:
"What is Love?" is a popular song by TWICE released in 2018. The song explores the curiosity and excitement about what love is like, especially from a youthful perspective—wondering about love through books, movies, and imagination. Could you clarify if you want info about the song, the concept of love, or something else related?