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A comment on Oumuamua may be a hydrogen iceberg. Parent comment
1. Tug gets in same position and velocity as its target, and docks.
2. Tug performs some kinda of burn to put both it and its target on the new trajectory.
3. Tug undocks and performs a burn to head off to where ever else it's needed.
If I understand correctly, it's really just a way to avoid putting engines and fuel tanks on things that don't need to change trajectory much.
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1. Tug gets in same position and velocity as its target, and docks.
2. Tug performs some kinda of burn to put both it and its target on the new trajectory.
3. Tug undocks and performs a burn to head off to where ever else it's needed.
If I understand correctly, it's really just a way to avoid putting engines and fuel tanks on things that don't need to change trajectory much.