Here's a breakdown of the process:

1. Transcription: DNA is used as a template to create a messenger RNA (mRNA) molecule.

2. Translation: The mRNA molecule travels out of the nucleus and into the cytoplasm, where it binds to a ribosome. The ribosome reads the mRNA sequence in groups of three nucleotides called codons. Each codon corresponds to a specific amino acid. Transfer RNA (tRNA) molecules bring the corresponding amino acids to the ribosome, and they are linked together in a chain, forming a polypeptide (protein).

So, translation is the step where the genetic code in mRNA is read and used to build a protein.