A good piece that explains the two concepts.

Because Romans 1:19-20 is one of the principal New Testament passages on the topic of ‘general revelation’, it may be helpful to summarize how ‘general’ differs from ‘special’ revelation. God’s self-revelation through ‘what has been made’ has four main characteristics. First, it is ‘general’ because made to everybody everywhere, as opposed to ‘special’ because made to particular people in particular places, through Christ and the biblical authors. Secondly, it is ‘natural’ because made through the natural order, as opposed to ‘supernatural’, involving the incarnation of the Son and the inspiration of the Scriptures. Thirdly, it is ‘continuous’ because since the creation of the world it has gone on ‘day after day…night after night’ (Ps. 19:2), as opposed to ‘final’ and finished in Christ and in Scripture. And fourthly it is ‘creational’, revealing God’s glory through creation, as opposed to ‘salvific’, revealing God’s grace in Christ.

–Dr. John R.W. Stott, The Message of Romans