This document discusses the key concepts of attention including its definition, characteristics, determinants, types, degrees, and alterations. Attention is defined as the process by which we orient ourselves to some stimuli and disregard others. The document outlines the main characteristics of attention such as its selective and shifting nature. It also examines the determinants that influence attention like intensity, novelty, and interest. Finally, it explores the different types of attention and factors that can impact attention levels like distraction and inattention.