Industrialization has made the world increasingly unstable, subjecting plants to various constraints. As a consequence, plants are constantly experiencing biological, environmental, and climatic constraints, necessitating defense mechanisms to ensure their survival. Plants are vulnerable to various biotic factors, including insects, pathogens (bacterial, fungal, viral, and nematodes), weeds, and herbivores. They also face different abiotic and climate change challenges such as drought (regulated by genes like GH3, DREB, ZIFL1;3, etc), salinity, heavy metals, metalloids, ultraviolet radiations (UV), ozone (O3), low and high temperature (chilling/cold/freezing/heat), carbon dioxide (CO2), chlorofluorocarbons (CFCs), and flooding/hypoxia/anoxia. Different transcriptional factors, such as KNOX1, PYK10, and NRP1, regulate these abiotic and climate change stresses. Different phytohormones such as auxin (regulated by components AUX/IAA3, PIN, indole-glucosinolate, indole-3-acetaldoxine), gibberellin (key elements involved in the synthesis and signaling such as DELLA, GA3ox, RhHB1), cytokinin (signaling through ARR5), ethylene (involved transcription factors like AP2/ERF), abscisic acid (signaling regulated through SnRK2), salicylic acid, jasmonic acid (regulated by JAZ1/TIFYIOA), brassinosteroids, nitric oxide, and strigolactones (synthetic precursor being GR24) control plants' maturation in normal and stressed conditions by regulating various metabolic and physiological plant activities. Phytohormonal interactions and their synergy are often assessed by different techniques and assays such as CRISPR/Cas9, ELISA, RIA, luciferase, GAL4, and mEmerald GFP. Their synthesis and signaling are regulated by various genes (such as YUCCA1, YUCCA5, GA3ox, etc), transporters (PIN, such as PIN, ABCB, NPF, etc), and receptors (such as PLY4, PLY5, BZR1/BES1, MYC2, etc) and have different precursors such as L-arginine, L-tryptophan, phenylalanine, linolenic acid, S-adenosylmethionine, geranylgeranyl diphosphate. This review comprehensively analyses the breakthrough in phytohormones and their signaling in regulating plants' growth and maturation. Their significance in combating the biotic, abiotic, and climate change stresses, improving stress adaptation to identify novel strategies enhancing plant resilience, sustainable agriculture, and ensuring food security.