Some epithelia are pseudostratified. What does this mean?

Explanation

Pseudostratified epithelial cells are columnar, but unequal in size is single layered yet it appears to be multi-layered because the 1 cells are columnar, but unequal in size. Although the epithelium in different cells. Hence, it is also called pseudostratified ep appears to be multi-layered because the nuclei lie at different levels ice, it is also called pseudostratified epithelium and its functions are protection, secretion and absorption