This study provides a comprehensive review of recent developments in the understanding of Soil–Structure Interaction (SSI) and Structure–Soil–Structure Interaction (SSSI) effects on the seismic behavior of buildings. It analyzes numerical, analytical, and experimental studies, focusing on soil–structure and adjacent building interaction performance. Numerical methods like Finite Element Method (FEM), Boundary Element Method (BEM), and hybrid approaches enable complex nonlinear analyses. Experimental methods offer validation data. The review highlights the importance of building arrangement, soil properties, and adjacent structures in SSSI effects. Knowledge gaps and future research directions are identified, including further experimental testing, and incorporating SSI and SSSI into seismic design codes. The findings provide insights for earthquake-resistant design, seismic risk assessment, and hazard reduction strategies. This review contributes to understanding complex soil–structure interactions and their implications for seismic performance, offering a foundation for future research and practical applications in earthquake engineering. The study also explores the evolution of SSI and SSSI concepts, tracing their historical development and the gradual recognition of their significance in seismic analysis.