In the lines from Shakespeare's As You Like It, the author is comparing life to a theatrical play. The idea that "all the world’s a stage" suggests that life is a performance, where individuals (the "men and women") are like actors playing various roles throughout their existence.
These things are similar in that both life and theater involve a series of acts or phases ("exits and entrances"), where individuals take on different identities or roles at different times. Just as actors portray various characters in a play, people assume different roles as they navigate through different stages of life, such as childhood, adolescence, adulthood, and old age.
Through this analogy, Shakespeare is conveying that life is transient and filled with various experiences, much like a play with distinct scenes. He suggests that our identities are not static, but rather shaped by the roles we play in different contexts and relationships. Additionally, it highlights the performative aspect of social interactions, where individuals may present themselves differently depending on the circumstances. Ultimately, this reflects on the human experience as a complex and ever-changing journey.