Difference between normal and digital servo's

[versed island]

Don't know the differences tbh
https://www.ebay.ie/itm/225587867658?hash=item348615b00a:g:b4wAAOSwxFRgT3ad&amdata=enc%3AAQAIAAAAwK65bXsB56Wj%2Famw8PBCBFs%2BW1od5%2Fvr5utuOnENDJBtj8z3rYY19anI3BmO3DjywBY09bDb%2B62j32SYoGyYewPWPLQbH7GxRJVb47qLp1ZIOX3b3CvcqGS%2BiDaTAogOxWfw2otRsbX4xlGZZKNJxO%2B0qsz3wL8W3KIIfyRx%2BTOTfpOjN7hww897QoSZPjNZ%2Fh0k%2Fsbs3W7YPI0Eek3RagE8OziJzbfN8KCEgsCyp2mxF3uoP1SN%2BN97XTZ8IyGgVg%3D%3D|tkp%3ABk9SR9K4wNL_Yg

[floral escarp]

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[versed island]

Like why is there 2 types of Servo's, Normal and Digital