John Ternus becomes Apple’s new CEO on Tuesday.

He replaces Tim Cook.

Cook led the company for 15 years.

During that time, Apple’s value grew to $4.6 trillion.

This happened because the iPhone was very popular.

The change comes when Apple faces pressure in artificial intelligence.

The company has had problems.

It promised AI features but did not deliver them on time.

Earlier this year, it showed new upgrades to Siri.

These upgrades focus on privacy and daily use.

Apple is trying to catch up with other companies.

Ternus must go beyond his work in hardware engineering.

He needs to keep Apple strong in AI.

He also has questions about the supply chain.

He must manage relations with President Donald Trump.

Trump praised Cook publicly on Tuesday.

Ternus worked on products like the Apple Watch, AirPods, and Vision Pro under Cook.

He will lead next week’s iPhone launch in Cupertino, California.

Cook is expected to stay as executive chairman.

He will likely help keep Apple’s ties with Trump.