They are bonded by a sea of free moving electrons hence why metals are generally malleable.
Metals for microscopic crystals using van-der-wah bonds where they mutually share electrons.
A metallic bond is not actually a bond but it is an interaction between conduction electrons and metallic nuclie . And also there is no single metallic bond .
Ionic bonds are formed between nonmetals and metals when they bond. The metals give electrons to the nonmetal.
A positive metal ion and the electrons surrounding it.