diff --git a/OOPS/accessspecifire.cpp b/OOPS/accessspecifire.cpp
new file mode 100644
index 0000000..c364914
--- /dev/null
+++ b/OOPS/accessspecifire.cpp
@@ -0,0 +1,26 @@
+#include <bits/stdc++.h>
+using namespace std;
+class myClass
+{
+private:
+    int y = 10; // declared as inaccessible
+public:
+    int x = 5;
+    myClass() // constructor having same name as the class
+    {
+        cout << "hello world!";
+    }
+};
+int main()
+{
+    myClass myObj;
+    cout << myObj.x;
+    // cout << myObj.y;
+    return 0;
+}
+/*cessspecifire.cpp:18:19: error: 'int myClass::y' is private within this context
+     cout << myObj.y;
+                   ^
+accessspecifire.cpp:6:13: note: declared private here
+     int y = 10; // declared as inaccessible
+             ^~*/
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diff --git a/OOPS/accessspecifire.exe b/OOPS/accessspecifire.exe
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diff --git a/OOPS/addconstructor.cpp b/OOPS/addconstructor.cpp
new file mode 100644
index 0000000..6a2a576
--- /dev/null
+++ b/OOPS/addconstructor.cpp
@@ -0,0 +1,15 @@
+#include <bits/stdc++.h>
+using namespace std;
+class myAddition
+{
+public:
+    myAddition(int x, int y) // constructor having same name as the class
+    {
+        cout << "Sum: " << x + y;
+    }
+};
+int main()
+{
+    myAddition myObj(4, 5);
+    return 0;
+}
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diff --git a/OOPS/addconstructor.exe b/OOPS/addconstructor.exe
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diff --git a/OOPS/class.cpp b/OOPS/class.cpp
new file mode 100644
index 0000000..3b900e2
--- /dev/null
+++ b/OOPS/class.cpp
@@ -0,0 +1,14 @@
+/*Classes in Cpp*/
+#include <bits/stdc++.h>
+using namespace std;
+class myClass
+{
+public:
+    string s = "hello";
+};
+int main()
+{
+    myClass myObj;
+    cout << myObj.s;
+    return 0;
+}
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diff --git a/OOPS/class.exe b/OOPS/class.exe
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diff --git a/OOPS/classmethod2.cpp b/OOPS/classmethod2.cpp
new file mode 100644
index 0000000..508fc66
--- /dev/null
+++ b/OOPS/classmethod2.cpp
@@ -0,0 +1,19 @@
+/*class methods inside class defination*/
+#include <bits/stdc++.h>
+using namespace std;
+class myClass
+{
+public:
+    void myMethod();
+};
+void myClass ::myMethod()
+{
+    cout << "hello world from outside the class!";
+}
+
+int main()
+{
+    myClass myObj;
+    myObj.myMethod();
+    return 0;
+}
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diff --git a/OOPS/classmethod2.exe b/OOPS/classmethod2.exe
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diff --git a/OOPS/classmethods.cpp b/OOPS/classmethods.cpp
new file mode 100644
index 0000000..7073736
--- /dev/null
+++ b/OOPS/classmethods.cpp
@@ -0,0 +1,17 @@
+/*class methods inside class defination*/
+#include <bits/stdc++.h>
+using namespace std;
+class myClass
+{
+public:
+    void myMethod()
+    {
+        cout << "hello world!";
+    }
+};
+int main()
+{
+    myClass myObj;
+    myObj.myMethod();
+    return 0;
+}
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diff --git a/OOPS/classmethods.exe b/OOPS/classmethods.exe
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diff --git a/OOPS/constructor.cpp b/OOPS/constructor.cpp
new file mode 100644
index 0000000..ab20e71
--- /dev/null
+++ b/OOPS/constructor.cpp
@@ -0,0 +1,16 @@
+#include <bits/stdc++.h>
+using namespace std;
+class myClass
+{
+public:
+    myClass() // constructor having same name as the class
+    {
+        cout << "hello world, I am a constructor!";
+    }
+};
+int main()
+{
+    myClass myObj; // constructor call itself
+
+    return 0;
+}
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diff --git a/OOPS/constructor.exe b/OOPS/constructor.exe
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diff --git a/OOPS/encapsulation.cpp b/OOPS/encapsulation.cpp
new file mode 100644
index 0000000..5479c61
--- /dev/null
+++ b/OOPS/encapsulation.cpp
@@ -0,0 +1,25 @@
+#include <bits/stdc++.h>
+using namespace std;
+class Employee
+{
+private:
+    int salary;
+    // through encapsulation we can access private data members
+public:
+    // setter method to set salaray
+    void setsalary(int s)
+    {
+        salary = s;
+    }
+    int getsalary()
+    {
+        return salary;
+    }
+};
+int main()
+{
+    Employee empObj;
+    empObj.setsalary(50000);
+    cout << empObj.getsalary();
+    return 0;
+}
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diff --git a/OOPS/encapsulation.exe b/OOPS/encapsulation.exe
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diff --git a/OOPS/polymorphism.cpp b/OOPS/polymorphism.cpp
new file mode 100644
index 0000000..95bbe43
--- /dev/null
+++ b/OOPS/polymorphism.cpp
@@ -0,0 +1,25 @@
+#include <bits/stdc++.h>
+using namespace std;
+class Animal
+{
+public:
+    void animalsound()
+    {
+        cout << "this animal makes sound....";
+    }
+};
+class Monkey : public Animal
+{
+public:
+    void animalsound()
+    {
+        cout << "monkey makes sound....";
+    }
+};
+int main()
+{
+    Monkey myObj;
+    myObj.animalsound();
+    myObj.Animal::animalsound(); // Call animalsound() from Animal class
+    return 0;
+}
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diff --git a/OOPS/polymorphism.exe b/OOPS/polymorphism.exe
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