Economics Bond price and Bond Yield Question

A fall in interest rates makes bond prices rise, and bond yields fall — and rising interest rates cause bond prices to fall, and bond yields to rise. In short, a rise in bond yields means interest rates in the monetary system have fallen, and the returns for investors (those who invested in bonds and govt securities) have declined.

From Article - https://indianexpress.com/article/explained/explained-what-rise-in-bond-yield-means-for-investors-and-govt-7205054/

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Explained: What rise in bond yield means for investors, government

The sudden rise in domestic and global bond yields recently moderated the enthusiasm of equity market participants around the world.

What exactly is "interest rate " mentioned in para- Repo rate or rate of return or what?