OWD means org wide defaults is to give base level of record access to each of the object. For Example:- You can set base level access to Account as 'Private'. In this case logged user can only access the records created by him.
Lead is just like we organize a fair of car some people not interested its k.. but some people interested dats our lead...now at the end of our fair dats intersted lead are divide in three part...Account, Contact, Opportunity.. Oportunity is track and manage our bussiness potential..
OWD is a record level access for an organization which specifies the level of access a user has to other user data and is basically used to restrict access. You can change the organization-wide sharing settings for both standard and custom object. https://www.sfdc-lightning.com/2018/10/owd-in-salesforce.html
Organization Wide Defaults(OWD) in salesforce is the baseline level of access that the most restricted user should have. Organizational Wide Defaults are used to restrict access. You grant access through other means like(sharing rules, Role Hierarchy, Sales Teams and Account teams, manual sharing, Apex Sharing ). In simple words Organization Wide Defaults(OWD) specify the default level of access users have to each other’s records. http://www.sfdcpoint.com/salesforce/organization-wide-defaults-owd-in-salesforce/
Once users have got access to the Organization and the Objects, it is important to set a baseline level of visibility for each object across the entire organization. The Organization-wide Default or OWD in Salesforce decides what access and permissions users have to the records they do not own. https://sfdcwisdom.com/owd-in-salesforce/
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For Example:- You can set base level access to Account as 'Private'. In this case logged user can only access the records created by him.
Oportunity is track and manage our bussiness potential..
https://www.sfdc-lightning.com/2018/10/owd-in-salesforce.html
http://www.sfdcpoint.com/salesforce/organization-wide-defaults-owd-in-salesforce/
https://sfdcwisdom.com/owd-in-salesforce/