How do blue blocks make Kaspa more secure?

Blue blocks strengthen Kaspa's security through a mechanism called Blue Work accumulation. In proof-of-work blockchains, security comes from the total amount of computational work that has been done — the more work, the harder it is for an attacker to rewrite history. In Kaspa, blue blocks are the ones chosen by GHOSTDAG as part of the main consensus, and their combined proof-of-work adds up as Blue Work, building a wall of security around confirmed transactions. Because Kaspa can designate many concurrent blocks as blue rather than discarding them, it accumulates this protective work much faster than a traditional single-chain design. For a beginner, the takeaway is that more accepted work means a more secure network, and GHOSTDAG's blue-block system is how Kaspa achieves that.