file won't upload unless i change the file permission to 0777 on my server

Question

hi there,

i am unaware on the cons and pros of giving the directory permission to 0777, and i have left with no choice but to use the 0777 file permission to upload files on my server through my application.

the following file permission works for me to upload file 0757 and 0557. this means i can upload the file with the world or other permission and not from user or group.

is it safe for me to use that permission. if not what is wrong with the application, why is refusing to upload through user or group.

thank you