説せつ明めい会かい

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Meanings

1

information session; briefing; explanatory meeting

A meeting or session held to explain something, such as a product, service, policy, or event, to an audience.

I attended the briefing for the new product.

入にゅう社しゃ前まえに会かい社しゃ説せつ明めい会かいがあります。

There will be a company information session before joining.

発はっ表ぴょう会かい
説明会 is an informational briefing session, while 発表会 in its commercial sense is more of a showcase event unveiling a new product or plan.
公こう聴ちょう会かい
説明会 is a briefing session where organizers explain something to attendees, while 公聴会 is a formal hearing focused on gathering public input.
オリエンテーションN1
説明会 is a native Japanese term for an information/briefing session and can be used for job or product explanations, while オリエンテーション is specifically for introducing newcomers to an organization or system.
講こう演えん会かいN3
説明会 is an informational briefing session (e.g. for jobs or admissions), while 講演会 focuses on a formal lecture, often by an expert.

Compound of 説明 (setsumei, 'explanation') and 会 (kai, 'meeting').