In Genesis, pitch sealed Noah's Ark against the Flood. Genesis 6:14 instructs Noah to cover the Ark inside and outside with pitch, a waterproofing substance.
Pitch is a thick, sticky material traditionally made from tar, bitumen, or resinous substances. Ancient boat builders used waterproof coatings to reduce leakage, so the instruction has a recognizable practical function within the story.
English translations differ slightly in how they render the Hebrew term, sometimes using “bitumen,” “tar,” or “pitch.” These words describe related waterproofing materials rather than different episodes in the account.
The instruction is separate from the Ark’s building material. Genesis names gopher wood for construction and pitch for coating. Confusing those two details can lead to an incorrect answer about what the Ark was made from.