The largest tech companies by market cap, ranked. Nvidia, Apple, and Microsoft lead -- see who rounds out the list.

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PayPal is pitching an AI-led turnaround, tying automation and restructuring to $1.5 billion in savings as it cuts jobs and works to modernize its tech stack.

Photonics is considered to be a more efficient alternative to the current process of transferring data using electricity, which could be crucial to the AI boom.