The interaction between plants and their associated microbiome is now influential to the success of sustainable agriculture techniques. Plants are unable to withstand adverse weather conditions, predator attacks, parasitic infections, and pathogenic invasions because they are immobile. Plants and microorganisms have evolved multiple approaches to combat abiotic and biotic agents, and these mechanisms are regulated by a variety of interactions. Therefore, it is essential to comprehend the mechanisms of communication between plants and microbes in order to reduce the negative effects of biotic and abiotic agents on agricultural crops and establish intriguing, sustainable methods of farming. Plant growth-promoting (PGP) microbes are among the diverse population of microorganisms that have garnered special attention due to their many functional traits, such as their ability to effectively colonize roots, fix nitrogen, solubilize minerals, and produce hormones and certain enzymes that are advantageous for sustainable agriculture. This field of study has been greatly advanced by ongoing developments in high-throughput sequencing platforms, omics-based methodologies, and gene editing technologies. It has allowed us to more thoroughly and precisely characterize the relationships between plants and their associated microbial communities. Additionally, the genomic and post-genomic eras have greatly improved our understanding of the intricate mechanisms behind those interactions, offering new opportunities for the effective use of information in the development of sustainable agriculture methods.