What was psychologist george miller describing in his paper entitled the magical number seven plus or minus two?

In his paper "The Magical Number Seven, Plus or Minus Two," psychologist George Miller described the limits of human cognitive capacity, particularly in relation to memory. He proposed that individuals can typically hold about seven items (plus or minus two) in their working memory at one time. This finding highlights the constraints of our short-term memory and has influenced various fields, including psychology, education, and information design. Miller's work emphasizes the importance of chunking information to enhance memory retention.