SPSS means Statistical Package for the Social Sciences. It is statistical software used for data entry, cleaning, descriptive statistics, hypothesis testing, regression, survival analysis, and presenting results in tables and figures. The official current major release is IBM SPSS Statistics version 31; IBM describes version 31 as the latest release with new algorithms and product enhancements. (ibm.com)
Older versions include SPSS 25, 26, 27, 28, 29, and 30. The newest available version reported by IBM is SPSS Statistics 31. (ibm.com)