The convergence of insurance and investment functions within a single financial instrument has emerged as one of the most consequential structural shifts in global capital markets over the past decade. This paper examines the mechanisms, empirical performance, and forward-looking trajectory of insurance-investment integrated products — chiefly unit-linked insurance plans (ULIPs), variable annuities, and bancassurance-distributed investment life policies — across major jurisdictions from 2019 to 2024, with projections extending to 2030. Drawing on data from the OECD Global Insurance Market Trends (2025), Allied Market Research, Mordor Intelligence, and McKinsey & Company's Global Insurance Report 2025, the study finds that the global unit-linked insurance market reached USD 1.06 trillion in 2024 and is forecast to expand at a compound annual growth rate (CAGR) of 10.3%, potentially surpassing USD 1.8 trillion by 2030. The Asia-Pacific region dominates with a 52.3% market share, propelled by rising household wealth, digital distribution infrastructure, and regulatory reform. The study further identifies the role of macroeconomic variables — interest rate cycles, equity market returns, and inflation — in shaping consumer allocation between guaranteed and market-linked products. The MSCI World Index gains of 24.4% in 2023 and 19.2% in 2024 are shown to correlate positively with ULIP premium inflows across Belgium, Finland, Lithuania, Portugal, and Romania. The paper concludes with a discussion of regulatory, technological, and demographic drivers expected to govern growth to 2030, including embedded insurance ecosystems, artificial intelligence in portfolio personalisation, and the green finance imperative.