.ora .dbf extension

what is difference between .ora and .dbf extension of data file?
should i create a data file with .dbf extension?

if I trying to creat a data file using OEM, .ora is the default extension.. why?
jung1975Asked:
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johnsoneSenior Oracle DBACommented:
The most common naming conventions that I have run across is:

.dbf for database
.log for redo logs
.ctl for control files
.arc for archive logs
.ora for init.ora file
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