Although people often mistakenly refer to interpreters as "translators", each job involves specific and distinct skills. Both require the mastery of at least two languages, but translators work exclusively with written text, while interpreters deal primarily with spoken language. Interpreters are frequently used in real-time situations like conventions, presentations or court hearings. At meetings of the United Nations, for example, there are interpreters listening to what is said and almost simultaneously communicating that message in another language. Interpreters also sometimes accompany business people on trips to cultures they are unfamiliar with to help navigate social cues and customs that are culture-specific.
If you are looking for someone to attend a meeting and communicate in another language on your behalf, you need an interpreter.
If you are looking for someone to translate the language of your data and text documents for the meeting, you need a translator.