What are the transition elements? Write the two characteristics of the transition elements

The elements which lie in between s-and p-block elements in the long form of periodic table are called transition elements.
These elements have their properties which are intermediate between those of s-and p-block elements and represent a change from the most electropositive s-block elements to the least electropositive p-block elements.
General characteristics of transition elements
(i) Their melting and boiling points are very high that are attributed to the involvement of (n-1)d electrons resulting into strong interatomic bonding.
(ii) They exhibit paramagnetic behaviour, variable oxidation states, catalytic properties and tendency for the formation of coloured ions and complexes.