The Greek word ámpelos (ἄμπελος) refers to the grapevine or vine plant. It is used both literally for the agricultural vine and metaphorically in Jesus's powerful self-declaration 'I am the true vine.'
The vine is Israel's great symbol — planted by God, expected to bear fruit, prone to wildness (Isaiah 5:1-7, Psalm 80:8-16). Every vineyard parable and image in the Old Testament prepared the way for Jesus's stunning declaration in John 15: 'I am the true vine.' If Israel was the vineyard, Jesus is the vine itself — the source of life, sap, and fruitfulness. Disciples are branches: they bear fruit only by remaining connected to Him. Cut off, they wither and are burned. This is not threat but physics — branches separated from the vine die because life flows through union with Christ alone. Abiding is everything.