Why is indium used to make seals between glass and metals?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — boron group element Modern version of the periodic table of the elements (printable).

Indium is used to create hermetic seals between glass and metals because of its unique ability to "wet" (cling to) clean surfaces when it is in a molten state. This property allows the metal to form a secure, airtight bond with various materials, including glass, quartz, ceramics, and marble.1