Because any technical skill set is highly sought out for. It's a way of distinguishing from other applicants.
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Seminar marketing offers several advantages. It allows a speaker to market products and services directly to an audience that has already demonstrated a desire to pay for educational experiences, and seminar marketing provides a great opportunity to reach a high-end business audience.
Just do it yourself. It's not that hard.
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"Webinar" is a neologism from the 1990s, blending "web" and "seminar" to describe a live, online educational or informational presentation.