One of the reasons Japanese might be difficult for foreign speakers is that it contains “keigo” (honorific language). In recent years, even the number of Japanese people who cannot properly use polite language is increasing. However, in the Japanese business scene, how well a person can use polite speech is used to determine their quality as a business person. Use respectful, humble, and polite expressions appropriate for the situation.

Respectful language: Words used to show respect for the person with whom you are conversing, people associated to them, their possessions, situation, and actions.
Humble language: Words used to humbly express you, people associated to you, your possessions, situation, and actions.
Polite language: Words that make speech polite, and express things attractively.