Transition metals are a group of elements found in the d-block of the periodic table. They include metals like iron, copper, and nickel. These elements are known for their ability to form various oxidation states and complex ions, making them important in many chemical reactions. One key characteristic of transition metals is their ability to conduct electricity and heat, which makes them useful in construction and manufacturing. They also often have colorful compounds, which is why they are used in pigments and dyes. Their unique properties make them essential in various industries, including electronics and catalysis.