Why does every Beatles song have the songwriter credited as “Lennon-McCartney”?

Literally every song has the song has the songwriter credited as “Lennon-McCartney”…why?

Did they actually write every song together?

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nedkelly · 61-69, M

George Harrison:
Harrison wrote around 22 songs for the Beatles, showcasing his talent as a songwriter with tracks like "While My Guitar Gently Weeps," "Here Comes the Sun," and "Something".
Ringo Starr:
Starr wrote two songs for the band, "Don't Pass Me By" and "Octopus's Garden", and was credited as co-writer on four others