Transcription activator that recognizes two different DNA motifs: the CCAAT homology common to many promoters and the enhanced core homology common to many enhancers (PubMed:10799300). Important transcription factor regulating the expression of genes involved in immune and inflammatory responses. Transcriptional activator that enhances IL6 transcription alone and as heterodimer with CEBPB (By similarity). Binds DNA as a homodimer and as a heterodimer. Can form stable heterodimers with CEBPA, CEBPB and CEBPE. Interacts with SPI1/PU.1. Interacts with PRDM16. Belongs to the bZIP family. C/EBP subfamily.