What is restriction endonuclease?

What is a restriction endonuclease (restriction enzyme)? Why is the word restriction used to designate these?

Restriction endonucleases

Restriction endonucleases

What are restriction endonuclease enzymes? Explain how restriction endonuclease enzymes are named.

What are restriction endonuclease enzymes? Explain how restriction enodonudlease enzymes are named.

Restriction endonucleases :

Restriction endonucleases :