How to Remove Occurrences of a String using sed command

In case you have a large number of data provided in a TextFile, and now you need to remove the specific string character from a TextFile. It is not worth reading every line for a single word or character and manually removing the string. If you have a small set of data, you can use this approach, and For a large file, we cannot use this sluggish approach. So, we have to find a way to remove all the strings’ occurrences at once without opening a text file.