When the Bible mentions clouds, sometimes it refers to literal clouds (like we see in the sky) and, other times, the clouds are symbolic or are the visible manifestation of the divine presence. In the Old Testament, there are four types of clouds; two in the New Testament.
Old Testament
The Literal Cloud, The Metaphorical Cloud, The Theophanic Cloud, The Eschatological/Apocalyptic Cloud.
New Testament
The Literal/Metaphorical Cloud, The Theophanic/Eschatological Cloud.
Discover these types of clouds in Scripture here: Baker’s Evangelical Dictionary of Biblical Theology