What is the difference between httpd versions in RHEL?

Issue

• What is the difference between httpd24-httpd.x86_64 and
  httpd.x86_64?
• We want Apache to be installed company-wide. The yum search apache gives me: httpd.x86_64 and httpd24-httpd.x86_64. Which one to choose?

• What are the differences between these packages:

  httpd-2.4.6-88.el7.x86_64
  httpd24-2.4.6-62.ep7.el7.x86_64
  httpd24-httpd-2.4.34-7.el7.x86_64
  

• Which of these are primarily patched when security updates are rolled out for httpd?