Girl is a term used to refer to a female child or young woman.
In modern usage, girl can also mean:
1. A female friend (e.g., "my girls" meaning my female friends)
2. A term of endearment (e.g., "Hey girl!")
3. In slang, can refer to any person regardless of gender (e.g., "You go, girl!")
4. In LGBTQ+ context, can refer to a transgender woman