How using try catch for exception handling is best practice

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while maintaining my colleague’s code from even someone who claims to be a senior developer, I often see the following code:

try
{
  //do something
}
catch
{
  //Do nothing
}

or sometimes they write logging information to log files like following try catch block

try
{
  //do some work
}
catch(Exception exception)
{
   WriteException2LogFile(exception);
}

I am just wondering if what they have done is the best practice? It makes me confused because in my thinking users should know what happens with the system.

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