in the following datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/OP07.pdf
Which is a OP07 a high precision ultralow voltage offset OpAmp, it says in the datasheet.
The accuracy and stability of the OP07, even at high gain, combined with the freedom from external nulling have made the OP07 an industry standard for instrumentation applications
what is external nulling?
Take a look at a randomly chosen old op-amp, for example the TL081. The single-amp version will often have two pins named "offset null" or similar.
This is because they have a fairly large offset voltage that can cause problems if you want to amplify DC levels, and the offset voltage is different for each IC.
There are many ways to connect these pins but normally it's just a trimpot connected to the pins, with the wiper connected to the most negative supply rail.
Some opamps have a way of adjusting out the input voltage offset. This is usually performed with resistors or a potentiometer between two pins brought out for that purpose.
Example from Electronics-Notes (which also has a good description):
It means adjusting the op amp input offset voltage error towards zero with components external to the op amp, such as trimmer potentiometer or resistors connected to op amp adjustment pins.
