Would like to know how a table is populated

Good morning!

I am using TSQL, there is one table that was created years back by another empolyee, I am not sure how this table is populated? I checked the dependencies and it just gives the name of table. I want to know how the columns/data get populated in that table for example. "Freight.load" is the table name. i have ssms 2008

Thank you in advance!

You can run a trace and that will give you the required details.