Ribosome is an essential component of the protein producing machinery. It is a megacomplex of several proteins and ribosomal RNAs. 2009 Nobel Prize in Chemistry was awarded to three scientists for their outstanding study leading to identification of ribosome structure to the atomic level. There are many web sources describing the structure and function of ribosome but I found the following link a simple and yet most informative one.
If you want to see the video of "ribosome in action" go to this site from Venki Ramakrishnan lab:
Enjoy your weekend knowing the miracle of ribosome.