If there is a period at the end of a sentence followed by a new sentence, what is the correct spacing?

In modern typing standards, the correct spacing after a period that ends a sentence is one space. This practice is widely accepted in various writing and typing styles, including academic and professional formats. The shift from using two spaces after a period to one space reflects changes in typing conventions and readability. With the advent of proportional fonts and digital formatting, one space is now considered sufficient for clear separation between sentences.

While some individuals may adhere to older practices that advocate for two spaces, particularly in typewriter usage, contemporary guidelines prioritize efficiency and streamline text appearance. The idea that no spaces or an excessive number of spaces (like three) are required is not in line with current style guides. Thus, one space is the standard and preferred choice for professional and effective communication.