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A central theme of this collection is the use of high-throughput sequencing to expand our knowledge on complex ecosystems. Wei, Wang, and Chen provide a landmark analysis of the porcine gut microbiome, identifying over 10,000 prophage genomes. Their work reveals the pig intestine as a massive reservoir of lysogenic novelty, where prophages actively influence host fitness by encoding auxiliary metabolic genes, antibiotic resistance determinants, and virulence factors. Together, these findings expand viral reference databases and emphasize the ecological and functional importance of prophages in gut microbial communities. Aside from the data presented, the reader may also see the potential danger for possible future outbreaks of human and animal disease as a result of the mismanagement of porcine waste.Expanding this lens to a global scale, Wei and Chen introduce a staggering catalog of over 740,000 phage genomes across diverse habitats. Their findings demonstrate that nearly one-third of global phage species are absent from current reference databases. By mapping CRISPR-based interaction networks, they uncover the ecological rules governing phage communities and identify novel molecular tools, such as a phage-encoded Cas12 nuclease, hidden within these viral lineages.Complementing these large-scale surveys, Lu et al. provide a focused ecological discovery in the marine environment. By isolating two novel phages infecting bacteria from the genus Erythrobacter, they shed light on the viral predators of aerobic anoxygenic photoheterotrophs, key players in the ocean's carbon cycle, that represent a new genus within the Casjensviridae.As metagenomics provides a catalogue of the virosphere, other contributors to this issue focus on the mechanics of how these parts function. The structural nuances of the "arms race" between phages and bacteria are explored by Matusiak et al., who use AlphaFold2-Multimer modeling to re-examine the tail spike architecture of Caudoviricetes. Their work suggests that we have systematically underestimated the complexity of receptor-binding proteins (RBPs), revealing small, "hand-like" accessory proteins that may be the true mediators of host specificity. The described mechanisms may shed light on other types of virus-host interactions as well.The genomic signatures of this conflict are synthesized in a comprehensive review by Zhang, Chu, and Sun, who frame the interaction as a coevolutionary struggle shaped by an ever-evolving repertoire of restriction systems, CRISPR-Cas immunity, and viral antidefense innovations. Understanding these mechanisms is a prerequisite for eYective clinical intervention using bacteriophages in the short-, medium and long-term interactions.