The song "P.S. I Love You" by The Beatles was written by Paul McCartney, along with their longtime producer George Martin. It was released in 1962 as the B-side to their hit single "Love Me Do." The song is a love letter written by a man who is away from his beloved. Throughout the song, the writer expresses his feelings and assures his loved one of his unending love for her.

The opening lines of the song, "As I write this letter, send my love to you / Remember that I'll always be in love with you," set the tone for the entire song. The writer is expressing his love and asking that it be conveyed to his beloved while he is away. He asks her to keep the letter and cherish the words until they can be together again. The repetition of the line "P.S. I love you" throughout the song emphasizes the depth of the writer's feelings for his loved one and serves as a reminder of his devotion.

The lyrics of "P.S. I Love You" are simple yet powerful, encapsulating the universal experience of being separated from a loved one. The song is a timeless expression of love that has resonated with generations of music lovers.