Prime Minister Narendra Modi will inaugurate the fair on Thursday.
The fair lasts three days, ending on September 19.
More than 600 exhibitors, including about 300 international firms, will participate.
The theme is “Silicon to Systems: Building the Ecosystem”.
Activities include a start‑up pitch competition, a student hackathon, and a showcase of new technology.
The event aims to train many people in artificial intelligence and other future technologies.
The event gathers companies, scientists, and students to show how tiny computer chips are made.
Over 600 exhibitors will display new ideas, from making chips to designing them.
Special pavilions will help students learn skills for future jobs in electronics.
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