Effective means 'producing the result that was wanted or intended'.
Efficient means 'working well, without wasting time, energy or money'.
Effective significa 'que produce el resultado buscado o deseado'.
Efficient significa 'que trabaja bien, sin derrochar tiempo, energía o dinero'.
The advertisement was simple but effective.
This computer programme is really effective; it gives me the answer I need.
Since computers were installed, the administration us much more efficient.
This computer programme is really efficient; it gives me the answer in less than a second.
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