Translation is a process of synthesis of protein using mRNA as a template. Each codon (three nucleotides) corresponds to a certain amino acid that is included into the protein. The link between codons and amino acids is determined by the genetic code.
As a result, if mRNA transcript is GAU GCG ACU GAG, corresponding amino acid sequence (translation) is:
Asp - Ala - Thr - Glu
where Asp - aspartate, Ala - alanine, Thr - threonine, Glu - glutamate.