I look forward to seeing you. look forward toの意味は？（toは前置詞なのでingが続くよ！）

Q I look forward to seeing you. look forward toの意味は？（toは前置詞なのでingが続くよ！）

I look forward to seeing you. look forward toのいみは？（toはぜんちしなのでingがつづくよ！）