What does "double-spacing" mean in APA formatting?

Double-spacing in APA formatting refers to the practice of having the space between each line of text equivalent to the height of two lines, which means that there is no extra space added after paragraphs. This formatting style enhances readability and provides space for instructors or reviewers to make comments. In a properly double-spaced document, every line occupies the same amount of vertical space, ensuring uniformity throughout the text. This spacing is typically applied not just to the main body of the text but also to captions, block quotations, reference entries, and any other sections included in the document, maintaining consistency.