Here's a breakdown:

* Gene expression is the process by which the information encoded in a gene is used to create a functional product, usually a protein.

* Transcription is the first step in this process, where the DNA sequence of a gene is copied into a messenger RNA (mRNA) molecule. This mRNA molecule then carries the genetic information out of the nucleus to the ribosomes, where protein synthesis takes place.

Let me know if you'd like more details on the transcription process!