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Effective: something that is 'effective' achieves the desired goal (i.e. does what people want it to do).

Synonyms: successful, productive, constructive, fruitful, functional, powerful; worthwhile, helpful, of help, of assistance, beneficial, advantageous, valuable, useful, of use.

Efficient: Something that is 'efficient' uses a minimum amount of resources (e.g. time, money, fuel).

Synonyms: well-organized, systematic, structured, well-planned, well-run, logical, well-ordered, labour-saving, cost-effective.

E.g. As oil prices rise, consumers are increasingly buying fuel-efficient cars.

E.g. The company has used a firm of consultants to make sure their production processes are efficient.