Refer figure 9-12 (b):
Ribosome contains three sites called A-site, P-site and E-site. The A-site binds an incoming aminoacyl tRNA (transfer ribonucleic acid) with the complementary codon on the mRNA. The peptidyl tRNA is formed in the ribosome at P-site and holds the tRNA with the developing polypeptide chain and the E-site acts as exit site that contains deacylated tRNA without amino acid that is ready to be released from the ribosome.
The E-site holds the tRNA until when the next aminoacyl tRNA binds to the A-site. This procedure is controlled by the length and sequence of the growing peptide. When the tRNA is free from the E-site, it goes back to the cytoplasm and gets renewed by another amino acid. Like this, the tRNAs released from the E-site are recycled during the translation process.