The phrase "and so" is often used to indicate a continuation or conclusion based on what has been previously mentioned. It serves to connect thoughts or ideas, signaling that the following statement is a consequence or result of the previous ones. Essentially, "and so" means "therefore" or "for that reason."
The phrase "and so" combines the conjunction "and," which originates from Old English "and," meaning "together with," and "so," which comes from Old English "sō," meaning "in this manner" or "thus." Together, they create a phrase that links ideas in a logical manner.