What is restrictive covenants in the company's bond indenture?

When taking out a corporate bond, there is risk involved as companies can default on their bond repayments. Investors are aware of this risk and so when the bond is drawn up (bond indenture) the contract normally includes a number of restrictive covenants that prevent the company from defaulting purposely or increasing its option to default on purpose.

Possible convenants may include:

the company having to maintain its working capital above a certain level i.e level of debt to assets.

cant sell its assets without approval

a promise to provide certain financial statements to the lenders

etc