Concept:
Amines are organic derivatives of ammonia (\(NH_3\)) in which one or more hydrogen atoms are replaced by alkyl or aryl groups. The nitrogen atom in amines contains a lone pair of electrons.
Explanation:
Nitrogen atom in amines has an unshared (lone) pair of electrons.
This lone pair can accept a proton (\(H^+\)).
Hence, amines behave as Lewis bases or Brønsted bases.
Example Reaction:
\[
RNH_2 + H^+ \rightarrow RNH_3^+
\]
This shows proton acceptance, confirming basic nature.
Conclusion:
Due to the presence of a lone pair on nitrogen, amines exhibit basic properties.
\[
\boxed{\text{Answer: Bases}}
\]