What does justification mean in a Christian context?

In Christianity, justification refers to God's act of declaring a sinner righteous, which is not based on personal merit but on faith in Jesus Christ. Romans 4:5 explains that to him who does not work but believes on Him who justifies the ungodly, his faith is accounted for righteousness. This highlights that justification is an external declaration by God as a judge, rather than an internal process or transformation. It's crucial to understand that we are justified freely by His grace through the redemption that is in Christ Jesus (Romans 3:24). Therefore, justification reassures believers that their standing before God is secure through Christ's righteousness.