The testing phase holds paramount importance in the software development life cycle, serving as a linchpin for enhancing software quality and eventual success. Amid this pivotal phase, a multitude of challenges come to the fore, particularly within the domain of Web-based applications. Notably, two formidable challenges stand out: interoperability and integration. These challenges, intricately intertwined, wield significant influence over the efficacy of Web-based applications. In today's dynamic landscape, the significance and intricacy of Web-based applications have surged dramatically, evolving and shaping the technological sphere. This paper aims to expound upon the intricacies of integration and interoperability issues intrinsic to Web-based applications. Integration challenges arise from the amalgamation of diverse components and subsystems into a cohesive whole, often developed independently. Interoperability hurdles, on the other hand, pertain to ensuring compatibility across an array of platforms, browsers, and devices. As this paper unravels the labyrinthine nature of these challenges, it contributes to a deeper understanding of the dynamic interplay between integration, interoperability, and the success of Web-based applications.

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Keywords: Software Testing, Software Development Life Cycle, Web-Based Applications, Interoperability.