What is Brahman saguna?

From the text:

But there is also Brahman saguna, with qualities, where the suit fits. Now we call it Shiva, Krishna, Shakti, Ganesha; we can
approach it with some understanding; we can discern certain attributes-loving, merciful, frightening;-and we feel the gentle pull of relationship. Brahman saguna is Brahman made manifest to our limited senses, Brahman expressed not only in gods but in humans, animals, trees, in a handful of earth, for everything has a trace of the divine in it.