Eurodollar is not a currency forward . It is an interest rate forward. It is similar to an interest rate future .
I think you meant buy Euro forward , which would be a currency forward purchase. That is a level I topic.
An importer might buy a Euro forward contract when he has to take delivery of something denominated in Euros at some point in the future. He would try and lock in a rate today so that he could get a fixed rate of exchange. Let’s say he locks in $1.2 USD per Euro . If he wants to pay $100,000 only then he would be able to pay EUR 96,000 (approximately ) even if the Euro became much stronger . Of course he would also pay EUR 96,000 if the Euro became much weaker. In any case the importer is looking at a fixed sum of Euros to pay for his goods. The dealer will make up the difference if Euro strengthens or take profits if Euro weakens