This document discusses correlation and correlation analysis. It defines correlation as the degree of relationship between two or more variables, ranging from -1 (perfect negative correlation) to +1 (perfect positive correlation). There are three types of correlation: positive, negative, and no relationship. Correlation analysis is used to determine the strength, order, and degree of interchange between variables. It can be applied in fields like data analytics, marketing research, and business analysis. The document provides an example of calculating bivariate correlation between variables in SPSS and interpreting the results.